It depends on the site/region/promoter. Some sites allow camping and have plenty of parking. The schedule depends on the promoter. Most of the races in region 7 have 2 motos on sat and 1 on sunday so everyone has time to get home. There usually aren't extra fees for parking, but on some occasions like Nationals in Nashville there is. Just go hang out at one the next time you get a chance. Even if you don't compete you will learn a lot and be better prepared. Or just show up and compete:Banane36: