One such event is the Sunset Magazine Celebration Weekend. This annual tradition has been held as an open house for their property in Menlo Park, CA. A mere hop, skip, jump away from my home in Oz.
Since Sunset Magazine has relocated to Oakland, CA ( THANK YOU !!!! ) they will hold their Celebration weekend in Sonoma Conerstone. The new location is similar to Margarita Ranch near Atascadero, CA.
Again, Sonoma is just a little longer hop, skip and jump away in a Zipcar, but still its a trek. The price is about right and should be a good weekend to go especially since its after Mother's Day and before all the Graduation hoopla starts.
The opportunity to expand you trip would include a sojourn to Santa Rosa or tour the campus at Sonoma State.
One thing I do recommend if you should be going is sunscreen. No matter what makeup I use or slather on gallons of SPF XXX I always get burnt at this event.