Depending on what kind of lighting they have maybe ask if you can turn off any of the bright lights during a shot facing the crowds. Some of the photos I took from behind made the dance floor seems much brigther than it was due to the a spinning light that eventually by the time the shutter closed managed to just about cover the entire dance floor in bright light making it appear all lit up. Turning off that one light would have made a huge difference. Also make sure you have a safe place to keep camera equipment and tripod. Because my friends were running the show I kept my gear in the concession tucked away and yet still someone managed to spill coke and splatter a bit onto my camera. At first I thought it was all cleaned off no problem and kept shooting without problems the rest of the night ( there wasn't much just a few drops ) but the next day when I went to turn my camera on the power button was sticky....grrr Now I have to find a repair place that won't charge me extravagently.