Vendors and caterers provided snacks as well as real food. In this case, Harvey's Donuts brought a machine that made miniature donuts as you watched. It was basically a tiny lazy river with rotating scoops (in the "up" position in the photo), but using hot oil instead of water. At the end of the process, people working the booth would douse the donuts in powdered sugar or other toppings and put them out for passers-by to take.
NIKON CORPORATION NIKON D300, f/6.3 @ 170 mm, 1/320, ISO 320, No Flash
© Omari Stephens