For starters, try the NorCal yahoo Group (
http://groups.yahoo.com/group/NorCal-rvlist/). It's not that active but it's worth a shot. I was down there for about 7 years and flew out of HAF and Hollister, as well as being a member of EAA 338. This info mostly about 3 years out of date but....
Dan C just moved up there so he might get something going.
HAF has a couple RVs. Go get to know Brian Branscomb. He's a great local IA with a Vari-EZ. Good guy to know. Also go meet Mark, manager of the cafe' (at least I think he still runs it).
EAA 338 meets at Reid on the 3rd Tuesday. Check out the Chapter website, which I believe is managed by Paul Eastham (RV-9A at South Co). It's a smaller chapter with a high % of RV builders. Good group to know and one of the guys, Mark Russell, on VAF has been finishing an RV-8 for a while.
EAA 62 meets earlier in the month, but is, or was, a really big Chapter. Different strokes for different folks. Also meets at Reid.
The San Carlos Chapter was somewhat active with a number of RVs. I think Kevin Hester (VAF) may have some insight.
Half Moon Bay used to have a chapter but it was really small and I'm not sure if it's still active.
There's a handfull of RVs down at Hollister as well. It's a drive down there, but a great airport with a really diverse collection of airplanes and activities.
If all else fails, you can always start a new EAA Chapter at Palo Alto!
Hope that helps,
Jim
(Former Bay Area Inmate)