MewMew, I myself am going to the Huntington Beach one - it's in the Majestix shop at Old World Village, behind Bella Terra. I'll either be playing or judging - not sure which but probably judging, just to fulfill my "quota".
It's kinda tricky to find, so in case you don't know how to get there, here's how:
405, exit Beach Blvd. If you came from the south (i.e. were on 405 North), take the first right you see - Center Ave, then keep going, passing the freeway on-ramp. If you came from the north, the exit goes to Center Ave, so turn right there. (You can come down Beach Blvd from the north as well, and turn right on Center.)
There are 2 parking lots to Old World - west and east. The west one is more convenient as Majestix is closer to that end, though either way works. Once you're on Center Ave, to get to the east parking lot, turn right on the street where you see the Old World "globe" out front, and then left into the parking lot. For the west one (where I park), go straight, past the globe, and turn right into the parking lot directly off the street. (It's right before the railroad tracks.)
I mention all this because, for people who haven't been before, it's very difficult to find.