ManiacQuilter2 is right. Volunteers are ALWAYS needed. My sister was in charge of our last Quilt Show, and we had lots of trouble getting volunteers. You will be welcomed with open arms. You can even sit at some of the tables, so you may not have to do much standing, unless you want to. There are folks who relieve the vendors when they need a "rest room break," the white glove ladies, ticket takers, quilt raffle ticket sellers, fat quarter basket raffle ticket sellers, guild booth money takers, door prize people, loud speaker talkers, etc.
I hope you have already contacted the quilt show people, and I bet you have an answer almost instantly!
Dina