CityCamp is an unconference focused on innovation for municipal governments and community organizations. As an unconference, content for CityCamp is not programmed for a passive audience. Instead, content is created and organized by participants and coordinated by facilitators. Participants are expected to play active roles in sessions. This provides an excellent format for creative, open exchange geared toward action.
This weekend in San Francisco, Tropo is sponsoring the CityCampSF Hackathon. From 12pm Saturday Dec 10 until 12pm Sunday December 11th, civic-minded coders will be working together to make new tools, apps, and data available to make San Francisco better.
Some of the proposed hacks: http://www.wiredtoshare.com/citycampsf_hackathon_projects