Bay Area Steampunk Federation: Often have events in San Francisco, though mainly have gathering outside the city. Definitely the place to go for Bay Area Steampunks
-www.thesteampunkempire.com/group/bayareasteampunksociety
-www.facebook.com/groups/steamfederation

Port of St. Francis Cryptozooligical Society: "Founded to study and preserve those species and cultures which lie outside the mundane."
-www.thesteampunkempire.com/group/port-st-francis-cryptozoological-society

SFSteam eVents: Livejournal for SF events.
-http://sfsteamvents.livejournal.com/

We also have a Facebook page so you can keep abreast on events and goings on.