I'm not sure what kind of hunt club you are talking about, but why would you be "sitting for a few hours" at a hunt club ? Would this be in a duck blind or what?

At one year of age, your dog is still a pup, and like any kid, he will get 'antsy' once in awhile, but I can't see any reason why you wouldn't want to train him to a level that would preclude him from running at cars and jumping on cars and people. Running at cars could be a life-threatening situation, and NOT jumping up on cars and people should have been trained a number of months ago.

Are there cars and people all the time at your hunt club? Let him have a little freedom when there aren't any 'enticements', but as soon as he starts running at cars and people (and I'm guessing other dogs), your commands should be, "HERE"------"HEEL"-----"SIT",
and he should obey. And by one year of age, he should have already been taught to NOT jump on cars or people !

A dog will do what he wants to do unless you give him a command, and then he should do what he was commanded. There is no reason that a one year old shouldn't be able to sit at your side for at least an hour at a time -- then go for a short walk with him and let him pee and run off a little energy (Away from people and cars). Then he should be more than able to sit at your side for an hour again.

Speaking of sitting next to you, you say "I know I couldn't" --- does this mean that YOU couldn't or HE couldn't ? There's a big difference between him "just liking to walk around" and being out of control.

Let him have some occassional freedom, but get him under control when an 'encticement' is likely to turn him into a 'bad boy wild man'. I just don't understand why there could be a "constant flow of cars and people" -- when there are cars and people and other dogs, he needs to be under control, it's as simple as that.

You seem to have wanted answers that said -- "Yeah, it's normal, just give him another year to calm down" ........... but the real answer is "You need to control your dog".

I will say again, that this is a training problem, and not a dog problem.