You can now post an event with @smokesignal.events or anything else using community.lexicon.calendar.event, list the eprint among its URIs, and the paper shows where it was presented. @tangled.org repositories can now be referenced by at-uri rather than by URL. You can also point a paper at a @layers.pub dataset it introduces or uses. A dataset is named by at-uri rather than by a URL at some host, so the reference is to the record and doesn't depend on a particular page staying up. 