The only place I've been able to find so far is located in Magnuson Park, Seattle RC Racers. They meet infrequently due to renting space from the park. There's a planned event for this coming weekend (2/4 and 2/5) that I'm planning to check out with my son and maybe the members will have some suggestions too. I'll definitely post back if I hear anything.
I wanted to make sure I wasn't missing anything