I’m not yet 18, but close. Does my parent/guardian have to be right next to me the whole weekend?

No. A parent/guardian does not have to hang on to the under 18 individual the entire weekend. But it is wise for them to be within shouting distance. The parent/guardian needs to be there to provide supervision, personal and legal. It is not legal to have minors at an event (without parental supervision) where adults are in primary attendance.