Hi Tina!
Welcome to Bachido! Glad to make your acquaintance, and hear of another player in the local-ish area!
Are you specifically wanting to learn tsugaru shamisen? I know of one teacher in San Francisco (who a few Bachido members go to). However, she prefers not to teach tsugaru style as her expertise is in the jiuta~minyo style. So far, I’m the only one I know who teaches tsugaru shamisen Northern California. 
Where in the bay area are you located, if I may ask a personal question on a public forum?
If you’re in San Jose, I’d be willing to meet you up there to teach. (taking the bus is very convenient)
For group classes, so far that is the monthly workshop. After the March workshop, the next one will be April 5th or 12th. What’s more, we will have a special guest, Bachido member Aki Takahashi from Toronto! She’s an incredible singer and player, so that’s one workshop not to be missed. 
My goal with the monthly workshops is to establish a shamisen community in the bay area. It goes so well on the forum and so would be awesome for a real community to thrive as well! 
Cheers!
Kyle