SGB NorCal is the local ISGB chapter. There should be a meeting at Arrow Springs sometime in the next couple of months. There was one scheduled for that location a few months ago, but Arrow Springs moved locations and their studio wasn't ready yet. Next month's meeting is in Petaluma. There's no meeting in November, and the December meeting will be at Sharon Peters' in Alameda (Christmas party).
ISGB Western Region:
http://www.isgb.org/regional-information/west.html
Northern California chapter:
http://www.sgbnorcal.org