Event Data is our service to capture online mentions of Crossref DOIs. We monitor data archives, Wikipedia, social media, blogs, news, and other sources. Our main focus has been on gathering data from external sources, however we know that there is a great deal of Crossref metadata that can be made available as events. Earlier this year we started adding relationship metadata, and over the last few months we have been working on bringing in citations between DOIs.
This is a companion discussion topic for the original entry at https://www.crossref.org/blog/event-data-now-with-added-references/