A query to Google Scholar and quick skimming through the papers yields this as interesting start:
Event Registry – Learning About World Events From News http://wwwconference.org/proceedings/www2014/companion/p107....
Using news articles for real-time cross-lingual event detection and filtering http://ai2-s2-pdfs.s3.amazonaws.com/f917/c0cff24fed1af45f94c...