Tim-
I'm thinking either Oct/Nov or Apr/May. Less tourists, weather is the niciest at that time of the year, and lodging won't cost a arm and a leg. I don't camp but I will be more than happy to make arrangements for the camping junkies.
As far as the WA/OR people, they already have an event planned at Justin's. This will be the first event I've planned outside of the SFBay area, so I'm not trying to reach too far. I know if you're into hardcore R&R you can't beat pismo/morro bay. They have reasonable off-season accommodations, great resturaunts, excellent watering holes and a well regarded place for duners. Besides, it would be fair to do something within reach for the So-Kal guys, after all, Gary did make a trip up for dinner here once. But if you have a better suggestion that would appeal to Kali/WA and OR people, I'd like to hear about it.