I went to Abbey Road on the River last night. Vending wise you had all the trappings of a county fair. The usual food, and unfortunately, the usual drinks. Coors Light, Killians, Blue Moon (at a higher price) and some varieties of Mike's Hard Lemonade.
Maybe its asking too much for a better beer selection, but I know they can do better. Let's see, the Beatles were from England, would it be difficult to try and serve a couple British beers? Or tuck a small vending cart in the back corner of the venue that had a couple better choices?