Weekend Anime and Games in Westbrook and Game Citadel in Bangor are great, they hold weekly tournaments, mostly MTG and Warhammer but they do some other stuff as well. TLK Trading in LA is pretty cool but I don't really know if they hold events. Bull Moose is a record store chain that also deals in nerd accoutrement with locations across Maine and NH but being a larger company they don't really do events that often.