Who's going where in So Cal? Temecula is the closest to me, but I don't mind driving as far as Los Angeles or San Diego for an event like this. My go-to shop would probably be Brookhurst, though.
Really depends on the schedule. I'd imagine most stores will hold theirs on Saturday, and a couple on Sunday. I'll go to the Gameology one for sure cause that's where I patron the most even though Dice House is 10 mins from my house.
I've only been to Dice House once, and I wasn't particularly impressed by their table space.
I went to their Store Championship, and they had just enough table space for 14 people. But there was no more room for any other gaming. Still a great store though.