There is a pier in San Francisco upon which sits a large statue of gorilla named Dotty who lived at the San Francisco zoo for many years. Dotty is not relevant to the story, except that she was loved by all who knew her.
Every year there was a festival held on the pier at which one could buy all manner of fried foods and see some local San Franciscans doing comedy skits and the like. Since the comedy was pretty bad, but the food was pretty good, it quickly became tradition to hit all the of food stands hard and fast then melt away before being exposed to too much bad comedy.
Naturally, this annual event became known as the Gorilla Wharf Fair.