A moped rally hosted by the Creatures of the Loin over the final weekend in September of 2008.

300+ mopeders attended, arriving from all over the country. Branches present included:

I'm sure many others I don't remember

Rides covered the city, hills, Golden Gate Bridge and Marin County. There were races, BBQ's and crazy parties. This may have been the best rally ever?

This forum thread has links to some epic (and HD) ride footage, plus a link to the (lower quality) YouTube version.