It would be useful to be able to use Bridgy Publish to POSSE an indie RSVP post as a native RSVP to/on an Eventbrite event (e.g. real world example http://tantek.com/2015/266/t1/science-hack-day-san-francisco-sign-up ).

Related: #275
Related: https://indiewebcamp.com/rsvp#POSSE