I travel a lot between Sacramento (where I work and used to live) and Vallejo (where I live). Sacramento has a great gaming community with many of the events listed here http://www.meetup.com/sacramento-boardgamers/
. Not many people RSVP on the meetup, however, their events are well-attended. There's also a regular group that meets at Kupros downtown on Wednesdays (I think).
The group I tend to game with on a more regular basis these days is in Fairfield http://www.meetup.com/Fairfield-Tabletop-Gamers/
as it's a little closer to home and Justin is a fantastic organizer/game store owner. There are also other meetups closer to the east bay that I hear are popular and well attended. I just haven't made it to any of them.
Feel free to message me here on BGG if you'd like any additional information on any of the above-mentioned groups. Maybe I'll catch you at an event one of these days!