Spring Car Show The American Pontiac Association and Galveston. The American Pontiac Association has a car show every Spring. Once a year the guys shine up their rides and bring them to beautiful Galveston,Tx, Pier 21, Harbor House Hotel. The Spring Car Show is on a Saturday. Its an open car show open to all makes and models and it benefits the Diabetes Association. The shows are always a big event bringing cars from throughout the region.