A friend of mine sent me a link for an upcoming house concert at the "Sounding Board". The Sounding Board is a venue at a private home in Cupertino. I haven't attended an event there yet, but my friend tells me that it is a nice venue. I really support the house concert idea, see my earlier posts for information on how you can participate in the house concert opportunity.
Primarily, the Sounding Board focuses on Celtic music, but are open to acoustic music of any genre. You can view a listing of upcoming concerts on their concert schedule page.