The Computer History Museum ( http://www.computerhistory.org/ ) is a great stop if you can't find any timely events. (it across from one of the Google buildings... though I think for Google you probably have to call and see if you can get an appointment to visit Theres also a couple others in San Jose, the Intel Museum and the Tech Museum of Innovation.

Heres a link for you... http://www.ageekstour.com/prologue.html

Oh and make sure to check out some bookstores, the computers and programming sections of stores in the area are usually quite... satisfying. :-)