If it's anything like ours, it will be very fun, informal, and free of "gamesmanship".
The advice I can give (what little it's worth):
*Accuracy doesn't count for much. Get 2 holes in the BG as quickly as you can. If you can get 2 holes in the -1 area that's good enough.
*Practice the anciliary movements. Much of your time will consist of exchanging magazines with a baby doll in your arms while running and other assorted insanity. Train your hands to automatically draw & present, exchange magazines with retention, navigate your gear,etc until it becomes as second-nature as tying your shoes. Learn to do weird stuff like picking up your sidearm with your weak hand.
* Train like you fight. Use torso targets at the range and add cover and movement if at all possible. Don't be timid about sending a few more rounds in order to make sure you've stopped the threat.
* Start thinking tactically. Air-gunning is generally considered bad form; you're supposed to think on your feet. Use the cover, learn to count your shots, recognizing when to tactically engage and when to "slice the pie".
*If you don't have the safety rules ingrained in your behavior, brush up on 'em. The range officer will generally keep you out of trouble, but you can't count on him/her to save you from your own bad habits. Booger-hook off the bang-switch at all times unless you're going to pull it. Keep the muzzle where it belongs.
* BG recognition: Spot the shape and
look for hands. Penalties aren't as bad as the embarassment of unloading on granny in front of these guys.
Most of all, just have fun with it and use it as a learning experience.
That's way more than $0.02...