As far as bringing your own "stuff", as my Father would have said: "Better to have it and not need it than need it and not have it".....
The St. Armands Show in Sarasota this past spring was a LONG day, no question about it. And the only music was the Beach Boys blasting out of the back of my Coupe from a boombox.
When I first got my car I was hitting every car show I could find. I got burned out fast. I don't think I can count the reasons. There's a local guy here, Lance aka CollectorCarsTV, that does a lot of the local shows here. His judging is so biased I now only go to see the cars and people but won't register my car to be judged.
The show in Venice last month went well but was extremely hot. Events held down here in the summer are just plain tough, no way around it.
Bottom line is a show is what we make of it. I just do whatever it is I want to do then I leave. I have a nice digital camera with a KILLER zoom lens on it so I like taking pictures of good looking women. Oh, and cars too of course....
At "general" car shows there will sometimes be an "Anti-Vette" attitude. I've seen it a few times.
I like going to the "Mustang" shows just to drive through and piss off all the Mustang owners...
Couple of my buddies and I refer to them as the "All Nag Car Shows"....
Best suggestion I have is take the car shows with a grain of salt.....expect nothing and you won't be disappointed.....