I went to one with an older sibling and her then boyfriend that oddly enough I'm still in loose contact with (I blame his cat!) when I was 19 and... um...
Giving the details would make this a novella of sorts, but in short we all got absolutely piss ass drunk in employee parking (unknowingly!), rather high, and proceeded to do this once more before re-entering for the rest of the fair.
I have to stop myself, maybe I'll actually type out the entire thing if anybody cares. It's one of those chains of events that feels absolutely absurd every time I recount it. Amazing day at the ren fair for reasons mostly unrelated to the "ren" portion.