Best advice is to not approach the coaches unless your day is done for the camp, I know coaches can talk to you if your a senior, other class not quite sure. Also, when games are going on college coaches are not allowed to speak to anyone until the QDSN participants event participation is over.
Also for the QDSN, its my opinion but the first two appearances games/cage whatever your in are likely most important, as day goes on Sunday coaches tend to start heading home just like any tournament/showcase.
You won't see as many 60MPH pitchers as so many proclaim they throw the entire weekend. You'll see a few though, and coaches love the pitchers!
Don't argue with parents, and be on best behavior during camps/games/in parking lots, at local restaurants, etc.....
Just a thought for pitchers in the queen of diamonds try your best to warm up so the coaches can see you, preferably with your catchers close to the net, pitching so the coaches can see velocity and movements while warming up.
Don't underestimate the warm ups, they are very important coaches may watch these before the game even starts to see what kind of arm, footwork, etc.. you have.