If we had any shows, I would have likely stumbled upon some announcements by now. So far, I haven't even seen any clubs / societies here, let alone shows... and I've looked more than once. It's even difficult to find breeders, because many sites listing them seem to be incomplete and out of date. There was American Hamster Association at some point, but I don't think it went far. Your best bet is to move to California
They have California Hamster Association and actual shows there.