What goes on during contests? (besides yoyoing of course)

Well, I’m going to my first contest in June. I was wondering what kind of stuff goes on. Are there actual trick circles? Another big one is, is buying, selling, and trading yoyos common, or is it frowned upon?

Trick circles, normally people playing with other skilltoys, tons of buying selling and trading. Lunch lots of lunch’s. Dinner as well. If your an adult drinking after the contest.
expect competitors to be distracted during contest and not have time. Don’t get offended. talk with them after the show.

trading happens, selling happens, laughter happens… contests have everything that happens on a forum but in real time