Protect your equipment - DJ equipment is stolen often and is expensive to replace. Transport your equipment securely and store it in a safe place when it is not in use.
Keep the area around your booth clear - Wires and cables can present trip and fall hazards. Be sure that cables are stowed out of reach. Placing a barrier around your booth can ensure that party-goers are at a safe distance.
Be aware of your volume - Loud music can cause hearing damage. Be aware of the acceptable levels on any amplifiers that are being utilized.
Avoid throwing - Not everyone in your audience can catch or is paying attention so avoid throwing giveaways into the crowd.