Automatic Content Extraction

The ACE data is a dataset derived from various domains and extensively annotated with various types of entity and relation tags. More details about the dataset can be found at the below mentioned links. The paper Automatic Detection and Classification of Social Events makes use of this dataset.
http://www.itl.nist.gov/iad/mig/tests/ace/2008/
http://www.stanford.edu/class/cs224u/reldata/ENGLISHRDCV4_3_2.PDF