* If you are going to take glow sticks, it would be better to take the battery operated ones rather than the chemical ones. Why? Because the chemical ones only last a few hours, and you have to throw them away. That means more garbage for you to haul out. It also means more packaging you have to haul in.
* Be sure to take a roll of toilet paper. Even though the porta-potties come stocked, they do run out. The time to notice that there is no toilet paper shouldn't be after you've already sat down and started.
* Speaking of porta-potties; remember those things get dark inside, so it's a good idea to have a flashlight to see where you are aiming (if you are a guy) or what you are about to sit on. If you are a guy and find it too hard to hold yourself and a flashlight at the same time, glowsticks, especially battery operated ones, are recommended. Either that, or sit down. Just make sure you know where you're sitting.
* Baby wipes! Good for cleaning just about everything, including porta-potty seats!
-- A friendly reminder, nothing goes in the porta-potty except your potty. --
Okay, that's all I have for now, right at the top of my head.