This is an obvious one, so let's take a look at what planning ahead for a tailgating party really entails. Of course, if you're in charge of cooking you'll need to bring the food and the grill and maybe even the drinks. But what about the utensils, plates, cups, garbage bags and so on? Try to think of everything you'll be doing when you're tailgating and make a list of everything you'll need. Once you've parked and started your tailgate party, you most likely won't be able to leave the lot to pick up anything you might have forgotten.
Try to think of things that you'd need at home, and then bring them along. For some locations, this may mean planning ahead for extreme weather situations, like thunderstorms or even typical issues like using the bathroom. In fact, if there are no bathrooms available, it may even be necessary to rent a port-o-potty to make the afternoon a little more comfortable for everyone.
Next, find out how cleaning up after a tailgating party ensures that you and everyone around you will have a good time.