Of our local events, I would estimate that 10 of the 12 are actually held at sailing clubs. In my case, my nearest club (the one I belong to) is a one hour drive away - so it makes just as much sense for me to keep the race boat at home on the trailer and go to weekend regattas.
My club is catamaran friendly...most are still quite astonished at the speed and when I bring the cat out for club races I regularly lap the entire field (that's usually my challenge I present to myself). The problem is, relatively few cats make it out to sail club events. I joined this club because it is so catamaran friendly...the cats have just sort of evaporated.