Enough money to enjoy the variety of food and art. Many of the artists and craftspeople take credit cards, but you can't be sure. Bikes or skateboards. There will be bike racks at the Mulberry and Fourth Street entrances. Glass beverage containers.
Broken glass can be dangerous with the number of people sitting on the grass to enjoy the music.
Coolers are allowed, but they can be excess baggage with the variety of food and drink available.