On May 3rd and 4th, the MAKER Faire will be at the San Mateo Fairgrounds, which is just south of you guys. I went last year for a couple hours (I was driving through on my way back to Seattle and had Dunstan in the car) and it awesome.
Site: http://makerfaire.com/
My photos from last year: http://flickr.com/photos/afdn/sets/72157600349845082/