Six Apart - News and Events: Hacking on OpenSocial
http://www.sixapart.com/about/news/2008/01/hacking_on_opensocial.html
"Attention (hackers? Programmers?): If you live in San Francisco, or if you’ll be in town for Macworld next week, you’re invited to join an OpenSocial hackathon at the Six Apart offices in San Francisco."