Okay, here's a few suggestions i got so far:

Mountain View at a place called Tied House. They've got a HUGE parking lot
in the back and very close nearby overflow parking in a structure. It's also
near Cal train--just a quick 10 minute walk.

Gordon Biersch in San Jose. There's a big pay parking lot across the street.

Santa Clara Convention Center parking structure is shared with a Hotel. It's
either the Marriot or the Hilton. Park on the top lot, hang out there and
the hotel bar.

San Francisco Fifth and Mission structure has a GREAT top floor that isn't
crowded until late on Saturday. An alternate to that is the Moscone Garage
on 3rd. It's NEVER packed on Saturday. Close to lots of restraunts and bars
that could be taken over.

Fault Line in Sunnyvale. Big parking, big place.

Ricky's Marriot on Palo Alto does events

More to come i'm sure...