There is no limit on alcohol; it cannot be in glass containers when taken into the stands. But know that unruliness is not accepted. It is a family event.
There is one vehicle per campsite. Another vehicle will cost you another camping permit. There is a place to park extra vehicles for the weekend and it's a lot cheaper than another ticket. You can bring your camper anytime. There are always (non-electric) sites available in overflow. Don't worry about not getting a place to camp. Don't forget your "Virgin Hodager" sign!