Video recording of Day 1:


Video recording of Day 2:


The 4th Workshop on Challenges and Applications of Automated Extraction of Socio-political Events from Text (CASE) @ACL-IJCNLP 2021 (Online Event)

Proceedings are available! Please see: 

Today, the unprecedented quantity of easily accessible data on social, political, and economic processes offers ground-breaking potential in guiding data-driven analysis in social and human sciences and in driving informed policy-making processes. The need for precise and high-quality information about a wide variety of events ranging from political violence, environmental catastrophes, and conflict, to international economic and health crises has rapidly escalated (Porta and Diani, 2015; Coleman et al. 2014). Governments, multilateral organizations, local and global NGOs, and social movements present an increasing demand for this data to prevent or resolve conflicts, provide relief for those that are afflicted, or improve the lives of and protect citizens in a variety of ways. For instance, Black Lives Matter protests[1] and conflict in Syria[2] events are only two examples where we must understand, analyze, and improve the real-life situations using such data.

Event extraction has long been a challenge for the natural language processing (NLP) community as it requires sophisticated methods in defining event ontologies, creating language resources, and developing algorithmic approaches (Pustojevsky et al. 2003; Boroş, 2018; Chen et al. 2021). Social and political scientists have been working to create socio-political event databases such as ACLED, EMBERS, GDELT, ICEWS, MMAD, PHOENIX, POLDEM, SPEED, TERRIER, and UCDP following similar steps for decades. These projects and the new ones increasingly rely on machine learning (ML) and NLP methods to deal better with the vast amount and variety of data in this domain (Hürriyetoğlu et al. 2020). Automation offers scholars not only the opportunity to improve existing practices, but also to vastly expand the scope of data that can be collected and studied, thus potentially opening up new research frontiers within the field of socio-political events, such as political violence & social movements. But automated approaches as well suffer from major issues like bias, generalizability, class imbalance, training data limitations, and ethical issues that have the potential to affect the results and their use drastically (Lau and Baldwin 2020; Bhatia et al. 2020; Chang et al. 2019). Moreover, the results of the automated systems for socio-political event information collection may not be comparable to each other or not of sufficient quality (Wang et al. 2016; Schrodt 2020).

Socio-political events are varied and nuanced. Both the political context and the local language used may affect whether and how they are reported. Therefore, all steps of information collection (event definition, language resources, and manual or algorithmic steps) may need to be constantly updated, leading to a series of challenging questions: Do events related to minority groups are represented well? Are new types of events covered? Are the event definitions and their operationalization comparable across systems (Hürriyetoğlu 2019, 2020a, 2020b)? This workshop aims to seek answers to these kind of questions, to inspire innovative technological and scientific solutions for tackling the aforementioned issues, and to quantify the quality of the automated event extraction systems. Moreover, the workshop will trigger a deeper understanding of the performance of the computational tools used and the usability of the resulting socio-political event datasets.


Call for Papers

We invite contributions from researchers in computer science, NLP, ML, AI, socio-political sciences, conflict analysis and forecasting, peace studies, as well as computational social science scholars involved in the collection and utilization of socio-political event data. Social and political scientists will be interested in reporting and discussing their approaches and observe what the state-of-the-art text processing systems can achieve for their domain. Computational scholars will have the opportunity to illustrate the capacity of their approaches in this domain and benefit from being challenged by real-world use cases. Academic workshops specific to tackling event information in general or for analyzing text in specific domains such as health, law, finance, and biomedical sciences have significantly accelerated progress in these topics and fields, respectively. However, there is not a comparable effort for handling socio-political events. We hope to fill this gap and contribute to social and political sciences in a similar spirit. We invite work on all aspects of automated coding of socio-political events from mono- or multi-lingual text sources. This includes (but is not limited to) the following topics

  • Extracting events in and beyond a sentence
  • Training data collection and annotation processes
  • Event coreference detection
  • Event-event relations, e.g., subevents, main events, causal relations
  • Event dataset evaluation in light of reliability and validity metrics
  • Defining, populating, and facilitating event schemas and ontologies
  • Automated tools and pipelines for event collection related tasks
  • Lexical, Syntactic, and pragmatic aspects of event information manifestation
  • Development and analysis of rule-based, ML, hybrid, and human-in-the-loop approaches for creating event datasets
  • COVID-19 related socio-political events
  • Applications of event databases
  • Online social movements
  • Bias and fairness of the sources and event datasets
  • Estimating what is missing in event datasets using internal and external information
  • Novel event detection
  • Release of new event datasets
  • Ethics, misinformation, privacy, and fairness concerns pertaining to event datasets
  • Copyright issues on event dataset creation, dissemination, and sharing
  • Qualities of the event information on various online and offline platforms



This call solicits full papers reporting original and unpublished research on the topics listed above. The papers should emphasize obtained results rather than intended work and should indicate clearly the state of completion of the reported results. Submissions should be between 4 and 8 pages in total, plus unlimited pages of references. Final versions of the papers will be given one additional page of content (up to 9 pages plus references) so that reviewers’ comments can be taken into account.

Authors are also invited to submit short papers not exceeding 4 pages (plus two additional pages for references). Short papers should describe:

  • a small, focused contribution;
  • work in progress; 
  • a negative result;
  • a position paper.
  • a report on shared task participation.

Papers should be submitted on the START page of the workshop ( in PDF format, in compliance with the ACL 2021 author guidelines provided on .

The reviewing process will be double blind and papers should not include the authors’ names and affiliations. Each submission will be reviewed by at least three members of the program committee. If you do include any author names on the title page, your submission will be automatically rejected. In the body of your submission, you should eliminate all direct references to your own previous work.

Workshop Proceedings will be published on ACL Anthology.


Important Dates for Regular Papers

April 26, 2021: Workshop Paper Due Date
May 3, 2021: Workshop Paper Due Date 

May 28, 2021: Notification of Acceptance

June 5, 2021: Camera-ready papers due

August 5-6, 2021: Workshop Dates

Note: All deadlines are 11:59PM UTC-12:00 (“anywhere on Earth”).


Shared Tasks on Socio-Political and Crisis Events Detection

Event information detection consists of multiple subsequent steps that could drastically affect the quality of the resulted event database. Thus, we believe one must consider a complete scenario that consists of document and sentence classification as relevant or not, event coreference resolution, event information extraction, and event classification in relation to an event taxonomy, and test the results on a list of events created manually to determine performance of the state-of-the-art on this task.

With this objective in mind, we organize a shared task on socio-political and crisis event detection at the workshop. Although the subtasks form a coherent flow, task participants can focus on one or more of them. Therefore, participants can choose the tasks or subtask(s) they would like to participate in. Participants will have access to all of the data for all tasks and subtasks. Any combination of these resources to achieve high performance for any of the tasks is allowed. For instance, Task 1 data could be used to potentially improve the performance on Task 2 and vice versa. The tasks and subtasks are:


Task 1. Multilingual protest news detection

  • Subtask 1: Document classification ⇒ Does a news article contain information about a past or ongoing event?
  • Subtask 2: Sentence classification Does a sentence contain information about a past or ongoing event?
  • Subtask 3: Event sentence coreference identification Which event sentences (subtask 2) are about the same event?
  • Subtask 4: Event extraction What is the event trigger and its arguments?

We particularly focus on events that are in the scope of contentious politics and characterized by riots and social movements, i.e., the “repertoire of contention” (Giugni 1998, Tarrow 1994, Tilly 1984), which we name GLOCON Gold in our operationalization (Hürriyetoğlu et al. 2020a). The aim of the shared task is to detect and classify socio-political and crisis event information at document, sentence, cross-sentence, and token levels in a multilingual setting. The detailed description of the subtasks can be found in Hürriyetoğlu et al. (2019, 2020b). The data size for English is increased and data for Portuguese, Spanish, and Hindi are added in this edition.


Task 2: Fine-grained classification of Socio-political events

The objective of this task is to evaluate generalized zero-shot learning event classification approaches to classify short text snippets reporting socio-political events with fine-grained event types using the Armed Conflict Location & Event Data Project (ACLED) event taxonomy, which consists of 25 event subtypes pertaining to political violence, demonstrations (rioting and protesting) and selected non-violent, politically important events. The task is to label text snippets using ACLED types and potentially other types of similar events not covered directly by ACLED (unseen classes). One should keep in mind that the event definitions for task 1 and task 2 are not fully compatible.


Task 3: Discovering Black Lives Matter events in United States

This task is only an evaluation task where the participants of task 1 will have the possibility to evaluate their systems on reproducing a manually curated Black Lives Matter (BLM) related protest event list. Participants will use document collections provided by us to extract place and date of the BLM events. The event definition applied for determining these events is the same as the one facilitated for task 1. Participants may utilize any other data source to improve performance of their submissions.

Please find the detailed description of the tasks, application form, sample data, baseline scripts, and submission formats are on the dedicated repository (


Participants in the Shared Task are expected to submit a paper to the workshop. Submitting a paper is not mandatory for participating in the Shared Task. Papers must follow the CASE 2021 workshop submission instructions (ACL 2021 style template: and will undergo regular peer review. Their acceptance will not depend on the results obtained in the shared task, but on the quality of the paper. Authors of accepted papers will be informed about the evaluation results of their systems prior to the paper submission deadline (see the important dates).


Important Dates for the Shared Task

Release of training data for Task 1: March 14, 2021, Task 2: already available
Registration deadline: April 30, 2021
Release of test data for all tasks to registered participants: May 4 2021
Submission of system responses: May 8, 2021 (12:00 CET)
Results announced to participants: May 10, 2021
Shared Task Papers Due: May 21, 2021
Notification of Acceptance: May 28, 2021
Camera-ready papers due: June 5, 2021
CASE 2021 Workshop (presentation of the ST results): August 5-6, 2021

All deadlines are 23:59 AoE (anywhere on Earth) and in the year 2021, unless otherwise stated above.



Kristine Eck, Uppsala University

Machine Learning in Conflict Studies: Reflections on Ethics, Collaboration, and Ongoing Challenges

Advances in machine learning are nothing short of revolutionary in their potential to analyze massive amounts of data and in doing so, create new knowledge bases. But there is a responsibility in wielding the power to analyze these data since the public attributes a high degree of confidence to results which are based on big datasets.

In this keynote, I will first address our ethical imperative as scholars to “get it right.” This imperative relates not only to model precision but also to the quality of the underlying data, and to whether the models inadvertently reproduce or obscure political biases in the source material. In considering the ethical imperative to get it right, it is also important to define what is “right”: what is considered an acceptable threshold for classification success needs to be understood in light of the project’s objectives.

I then reflect on the different topics and data which are sourced in this field. Much of the existing research has focused on identifying conflict events (e.g. battles), but scholars are also increasingly turning to ML approaches to address other facets of the conflict environment.

Conflict event extraction has long been a challenge for the natural language processing (NLP) community because it requires sophisticated methods for defining event ontologies, creating language resources, and developing algorithmic approaches. NLP machine-learning tools are ill-adapted to the complex, often messy, and diverse data generated during conflicts. Relative to other types of NLP text corpora, conflicts tend to generate less textual data, and texts are generated non-systematically. Conflict-related texts are often lexically idiosyncratic and tend to be written differently across actors, periods, and conflicts. Event definition and adjudication present tough challenges in the context of conflict corpora.

Topics which rely on other types of data may be better-suited to NLP and machine learning methods. For example, Twitter and other social media data lend themselves well to studying hate speech, public opinion, social polarization, or discursive aspects of conflictual environments. Likewise, government-produced policy documents have typically been analyzed with historical, qualitative methods but their standardized formats and quantity suggest that ML methods can provide new traction. ML approaches may also allow scholars to exploit local sources and multi-language sources to a greater degree than has been possible.

Many challenges remain, and these are best addressed in collaborative projects which build on interdisciplinary expertise. Classification projects need to be anchored in the theoretical interests of scholars of political violence if the data they produce are to be put to analytical use. There are few ontologies for classification that adequately reflect conflict researchers’ interests, which highlights the need for conceptual as well as technical development.


Kristine Eck is an Associate Professor at the Department of Peace and Conflict Research at Uppsala University, where she serves as the Director of the Uppsala Rotary Peace Center. Her research interests concern coercion and resistance, including human rights, police misconduct, state surveillance, and conflict data production. She served as the Director of the Uppsala Conflict Data Program (UCDP) 2017-2018 and has been a Visiting Researcher at Oxford University, Copenhagen University, the University of Notre Dame, and Kobe University. Dr. Eck’s research has been funded by the Swedish Research Council, the Swedish Foundation for Humanities and Social Sciences, and the Norwegian Foreign Ministry.


Elizabeth Boschee, University of Southern California

Events on a Global Scale: Towards Language-Agnostic Event Extraction

Event extraction is a challenging and exciting task in the world of machine learning & natural language processing. The breadth of events of possible interest, the speed at which surrounding socio-political event contexts evolve, and the complexities involved in generating representative annotated data all contribute to this challenge. One particular dimension of difficulty is the intrinsically global nature of events: many downstream use cases for event extraction involve reporting not just in a few major languages but in a much broader context. The languages of interest for even a fixed task may still shift from day to day, e.g. when a disease emerges in an unexpected location.

Early approaches to multi-lingual event extraction (e.g. ACE) relied wholly on supervised data provided in each language of interest. Later approaches leveraged the success of machine translation to side-step the issue, simply translating foreign-language content to English and deploying English models on the result (often leaving some significant portion of the original content behind). Most recently, however, the community has begun to shown significant progress applying zero-shot transfer techniques to the problem, developing models using supervised English data but decoding in a foreign language without translation, typically using embedding spaces specifically designed to capture multi-lingual semantic content.

In this talk I will discuss multiple dimensions of these promising new approaches and the linguistic representations that underlie them. I will compare them with approaches based on machine translation (as well as with models trained using in-language training data, where available), and discuss their strengths and weaknesses in different contexts, including the amount of English/foreign bitext available and the nature of the target event ontology. I will also discuss possible future directions with an eye to improving the quality of event extraction no matter its source around the globe.


Elizabeth Boschee is the Director of the Boston office of the University of Southern California’s Information Sciences Institute and a Senior Supervising Computer Scientist in the Emerging Activities division. Her current efforts focus on cross-lingual information extraction, retrieval, and summarization, specifically targeting low or zero-resource settings, e.g. cross-lingual settings with <1M words of bitext or event extraction from non-English languages with only English training data. Prior to joining ISI, Boschee spent 17 years at BBN Technologies. As a Lead Scientist there, she was the chief architect of the BBN ACCENT event coder, the technology behind the W-ICEWS event data, which more than doubled the precision (while still increasing recall) of the previously deployed solution for CAMEO event coding.



August 5, 2021 (UTC)

Session 1: Kick-off & Keynotes (14:00 – 16:00 UTC)  
14:00-14:10 Challenges and Applications of Automated Extraction of Socio-political Events from Text (CASE 2021): Workshop and Shared Task Report  
14:10:00-15:00 Keynote 1: Events on a Global Scale: Towards Language-Agnostic Event Extraction Elizabeth Boschee
15:00:00-15:50 Keynote 2: Machine Learning in Conflict Studies: Reflections on Ethics, Collaboration, and Ongoing Challenges Kristine Eck
Session 2: Event Extraction – Regular papers (16:00-18:00 UTC) Chair: Lifu Huang (Virginia Tech)
16:00-16:10 PROTEST-ER: Retraining BERT for Protest Event Extraction Tommaso Caselli, Osman Mutlu, Angelo Basile and Ali Hürriyetoğlu
16:10-16:30 ArgFuse: A Weakly-Supervised Framework for Document-Level Event Argument Aggregation Debanjana Kar, Sudeshna Sarkar and Pawan Goyal
16:30-16:50 Modality and Negation in Event Extraction  Sander Bijl de Vroe, Liane Guillou, Miloš Stanojevic, Nick McKenna and Mark Steedman
16:50-17:10 Characterizing News Portrayal of Civil Unrest in Hong Kong, 1998–2020 James Scharf, Arya D. McCarthy and Giovanna Maria Dora Dore
17:10-17:20 Regressing Location on Text for Probabilistic Geocoding Benjamin J. Radford
17:20-17:40 Extracting Events from Industrial Incident Reports Nitin Ramrakhiyani, Swapnil Hingmire, Sangameshwar Patil, Alok Kumar and Girish Palshikar
17:40-18:00 Automatic Fake News Detection in Political Platforms – A Transformer-based Approach Shaina Raza

August 6, 2021 (UTC)

Session 3: Invited Speakers – Findings of ACL (14:00-16:00 UTC) Chair: Hristo Tanev (European Commission)
14:00-14:10 Few-Shot Upsampling for Protest Size Detection Andrew Halterman, Benjamin J. Radford
14:10-14:30 Corpus-Level Evaluation for Event QA: The IndiaPoliceEvents Corpus Covering the 2002 Gujarat Violence Andrew Halterman, Katherine Keith, Sheikh Sarwar and Brendan O’Connor
14:30-14:50 Trade the Event: Corporate Events Detection for News-Based Event-Driven Trading Zhihan Zhou, Liqian Ma and Han Liu
14:50-15:10 On the Ethical Limits of Natural Language Processing on Legal Text Dimitrios Tsarapatsanis and Nikolaos Aletras
Session 4: Shared Task Results: Socio-political and Crisis Events Detection (15:20 – 18:00 UTC)
15:20-15:35 Multilingual Protest News Detection – Shared Task 1, CASE 2021 Ali Hürriyetoğlu, Osman Mutlu, Erdem Y.rük, Farhana Ferdousi Liza, Ritesh Kumar and Shyam Ratan
15:35-15:45 IBM MNLP IE at CASE 2021 Task 1: Multigranular and Multilingual Event Detection on Protest News Parul Awasthy, Jian Ni, Ken Barker and Radu Florian
15:45-15:55 DAAI at CASE 2021 Task 1: Transformer-based Multilingual Socio-political and Crisis Event Detection Hansi Hettiarachchi, Mariam Adedoyin-Olowe, Jagdev Bhogal and Mohamed Medhat Gaber
15:55-16:05 Shared Task 1 System Description : Exploring different approaches for multilingual tasks Sureshkumar Vivek Kalyan, Tan Paul, Tan Shaun and Martin Andrews
16:05-16:15 Team “NoConflict” at CASE 2021 Task 1: Pretraining for Sentence-Level Protest Event Detection Tiancheng Hu and Niklas Stoehr
16:15-16:25 Team “DaDeFrNi” at CASE 2021 Task 1: Document and Sentence Classification for Protest Event Detection Francesco Re, Daniel Vegh, Dennis Atzenhofer and Niklas Stoehr
16:25-16:35 NUS-IDS at CASE 2021 Task 1: Improving Multilingual Event Sentence Coreference Identification With Linguistic Information Fiona Anting Tan, Sujatha Das Gollapalli and See-Kiong Ng
16:45-17:00 Fine-grained Event Classification in News-like Text Snippets – Shared Task 2, CASE 2021 Jacek Haneczok, Guillaume Jacquet, Jakub Piskorski and Nicolas Stefanovitch
17:00-17:10 IBM MNLP IE at CASE 2021 Task 2: NLI Reranking for Zero-Shot Text Classification Ken Barker, Parul Awasthy, Jian Ni and Radu Florian
17:10-17:20 CASE 2021 Task 2 Socio-political Fine-grained Event Classification using Fine-tuned RoBERTa Document Embeddings Samantha Kent and Theresa Krumbiegel
17:20-17:35 Discovering Black Lives Matter Events in the United States: Shared Task 3, CASE 2021 Salvatore Giorgi, Vanni Zavarella, Hristo Tanev, Nicolas Stefanovitch, Sy Hwang, Hansi Hettiarachchi, Tharindu Ranasinghe, Vivek Kalyan, Paul Tan, Shaun Tan, Martin Andrews, Tiancheng Hu, Niklas Stoehr, Francesco Ignazio Re, Daniel Vegh, Dennis Atzenhofer, Brenda Curtis and Ali Hürriyetoğlu
  Lightning talks of the Shared task participants  
17:35-17:38 IIITT at CASE 2021 Task 1: Leveraging Pretrained Language Models for Multilingual Protest Detection Pawan Kalyan, Duddukunta Reddy, Adeep Hande, Ruba Priyadharshini, Ratnasingam Sakuntharaj and Bharathi Raja Chakravarthi
17:38-17:41 FKIE_itf_2021 at CASE 2021 Task 1: Using Small Densely Fully Connected Neural Nets for Event Detection and Clustering Nils Becker and Theresa Krumbiegel
17:41-17:44 ALEM at CASE 2021 Task 1: Multilingual Text Classification on News Articles Alaeddin Gürel and Emre Emin
17:44-17:47 AMU-EURANOVA at CASE 2021 Task 1: Assessing the stability of multilingual BERT Léo Bouscarrat, Antoine Bonnefoy, Cécile Capponi and Carlos Ramisch
17:47-17:50 CASE 2021 Task 2: Zero-Shot Classification of Fine-Grained Sociopolitical Events with Transformer Models Benjamin J. Radford
17:50-17:53 SU-NLP at CASE 2021 Task 1: Protest News Detection for English Furkan Çelik, Tuğberk Dalkılıç, Fatih Beyhan and Reyyan Yeniterzi
17:53-18:00 Closing remarks  


Proceedings are available! Please see: 

Organization Committee

Ali Hürriyetoğlu (Koc University, Turkey)

Hristo Tanev (Joint Research Centre (JRC), European Commission, Italy)

Vanni Zavarella (Joint Research Centre (JRC) of the European Commission, Italy)

Reyyan Yeniterzi (Sabancı University, Turkey)

Aline Villavicencio (University of Sheffield, the United Kingdom; and Institute of Informatics, Federal University of Rio Grande do Sul, Brazil)

Erdem Yörük (Koc University, Turkey),

Deniz Yuret (Koc University, Turkey),

Jakub Piskorski  (Polish Academy  of Sciences, Poland),

Gautam Kishore Shahi (University of Duisburg-Essen, Germany).


Program Committee

Tommaso Caselli (University of Groningen, the Netherlands),

Osman Mutlu (Koc University, Turkey),

Fırat Duruşan (Koc University, Turkey),

Ali Safaya (Koc University, Turkey),

Bharathi Raja Asoka Chakravarthi (Insight SFI Centre for Data Analytics, the United Kingdom),

Gautam Kishore Shahi (University of Duisburg-Essen, Germany),

Jakub Piskorski (Polish Academy of Sciences, Poland),

Matina Halkia (European Commission – Joint Research Centre, Italy),

Benjamin J. Radford (UNC Charlotte, the United States),

Mark Lee (University of Birmingham, the United Kingdom),

YiJyun Lin (University of Nevada, the United States),

Fredrik Olsson (RISE, Sweden),

Kristine Eck (Uppsala University, Sweden),

Nelleke Oostdijk (Radboud University, the Netherlands),

Francielle Vargas (University of São Paulo, Brazil),

Farhana Liza (University of Essex, the UK),

Nicoletta Calzolari (Institute for Computational Linguistics, Italy),

Milena Slavcheva (Bulgarian Academy of Sciences, Bulgaria),

Harish Tayyar Madabushi (University of Birmingham, the United Kingdom),

Ritesh Kumar (Dr. Bhimrao Ambedkar University, India),

Alexandra DeLucia (Johns Hopkins University, United States),

Jasmine Lorenzini (University of Geneva, Switzerland),

Kalliopi Zervanou Eindhoven (University of Technology the Netherlands),

Andrew Lee Halterman (Massachusetts Institute of Technology, the United States),

Manuela Speranza (Fondazione Bruno Kessler, Italy),

Marijn Schraagen (Utrecht University, the Netherlands).

Niklas Stoehr (ETH Zürich, Switzerland)

Onur Uca (Mersin University, Turkey)
Tareq Al-Moslmi (University of Bergen, Norway)
Alfred Krzywicki (UNSW Sydney, Australia)



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