I know Matty will yell at me for saying anything but Enzo's, but the Green Radish is a good food truck option. Paging @Delish for details here. They did an event for us 2 years ago.
Vegan & Organic:
http://www.thegreenradish.com/
@Norm no yelly it's a free country. Enzo's is an option an close to the event.
one of the places around here tows in a wood fired pizza oven. someone other than nomad. will try to find it.