Also coming from the Bay Area (early April, for a week)...used to live in SF for six years...miss it a lot....maybe we'll run into one another wherever expats in BA congregate...I'll keep an eye on this forum in case somebody identifies a group that meets, per your question.
See the Expat Life Forum as there is a meet up tomorrow evening for drinks, as there is every Friday night. Mixed age group (I'm 52 myself!), and mixed nationalities, so feel free to come along and meet fellow travellers.....