EDITED TO ADD: Yes it will be raining, yes this is still happening. Bring a parasol & comfy shoes because if it's not raining too hard we might still do the outdoor portion of the tour.
Where: Villa Montalvo
http://montalvoarts.org/about/visit/15400 Montalvo Road
Saratoga, CA 95070 (about an hour south of San Francisco or 20 minutes from the heart of San Jose)
When:5/15 (see time line below)
What: Picnic, pictures, garden tour
Price: Parking & entry is free, picnic is potluck style, guided tour is $10
( more info... )