Steve ,
I'll admit that I have never attended a meet on the west coast , so I don't know just how crowded they are or how wide the aisles are . At York the pack them in .
As far as parking is concerned , common sense is the rule here . The earlier that you get there , the better the parking spot and therefore less steps to the car .
Most shows or meets in publicly owned buildings have an 8-10 foot aisle requirement. Those held in privately owned venues seem to be exempt and pack them in tighter.
Steve