For a one day pass, at this point, buying at the gate or from a scalper would probably be easiest. Camping won't be an option for you as it's only for those with 3 day passes. The campground will be completely full by Wed night anyway. Depending on your age and partying interest level, you may not want to be there anyway. It's CRAZY in there. Lots of fun, but not a place for those that like to sleep or feel that morals are important.