First car show -- advice??

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!
I'm fairly new to car shows and recently went to one big show where the classes were separated but the owner could choose where to park. I went straight to the Muscle class with my Swinger 340 stroker but was surprised to see another nearly identical Swinger stroker parked in the Classic class. I figure if you've got muscle...stick with it!