I'm not a barrel racer, however, I do go and watch my friends that do barrel race. This is a very relaxed and easy going crowd. Basic rules for any warm up would be: go with the flow (if everyone is going to the right--so do you), slower moving horses are more to the inside (middle) of the arena, look around and be aware of everyone's position, don't stop abruptly unless there is no one behind you. Give yourself at least a horse length between you and another rider. As I said, this is for a general warm up. You may get to the race and people are doing there own thing willy nilly and everything I said just went out the window LOL! But, they're definitely not a group that's going to ridicule and be overtly rude! You'll do fine! And have fun!