First car show -- advice??

I cant help with classes but yhe best advice is don't worry about what other people think or say about your car. There is always a douchebag who will pick apart everything to feel better about himself.

Hey FABO, I'm signing up for my first car show this month. I'm not looking to win anything, really just want to help raise some money for charity and have a good time.

I really have two general questions: what class should I enter my car in? And 2) is there any sort of "car show etiquette?"

My car is a '68 Barracuda fastback, slant, 7-1/4" rear with a manual 3 speed. So, obviously the car isn't anything special. She looks pretty, but she's not a hot rod or collectible. The three categories I think might apply are American Muscle, American Collectible, and Open. I'm leaning towards Open. What do you guys think? Should I just ask the people running the show?

Appreciate any input. Hope everyone has a happy New Year!