Wizards has posted the Austin PTQ schedule. You can click here for the full list of North American PTQs.
Here are the California dates and locations:
May 9 - San Diego
May 23 - San Jose
June 20 - Sacramento
June 27 - Los Angeles
August 22 - San Jose
August 29 - Los Angeles
I'm surprised that there's only one Sacramento listing so far. Perhaps that will change.
For thus of us who range a little farther afield, here are the adjacent PTQs:
August 1 - Phoenix and Las Vegas and Portland
Conveniently, all on the same day. This does mean, on the plus side, that none of these PTQs are guaranteed to be inundated with California players (although it's my understanding that Las Vegas usually gets the biggest California crowd).