Chris Wanstrath announces his participation in the Gilt Group's "Expert Talk" event on December 2nd in New York City, where he plans to discuss a variety of technical topics including GitHub, OEmbed, OAuth, Resque, comet, and BERT-RPC. He mentions that Leah will join him to elaborate on OEmbed and OAuth during the event. Wanstrath encourages those interested in attending to RSVP through the provided link, and he expresses enthusiasm about the upcoming event.