I don't know of a place where all the tournaments info. are kept, if that's what you're asking. Having said that, if you happen to find out more, please feel free to update B.C., possibly with a sticky. The following is a list of tournaments, based on the past.
UC Berkeley - once every 6 months
UC Davis - once every 6 months (Oct. and April)
Stanford - just host their 1st one past long weekend, probably more to come in the coming months/years
BBC - annual KTSF tournament
Affinity - at least once a year (around Dec./Jan.)
Synergy - just had their 1st one in December 2013
CBA - annual Senior Games (May), and NCCAF (team) in June
EBA - sometimes have tournaments
Annual Corporate Challenge (team) around May
And then you have charity tournaments, by Mission SJ, or this upcoming "Smash of Titans", or Santa Teresa $5 tournament
ZBTC sometimes hosts tournaments also.
There might be others. Each of the above has a club website you can contact.