I'm not sure about the main gate. It's going to be closing to the general public at 7pm though, so kinda not worth spending the $19 to get in today. If you want to camp over night and go to the adult themed stuff after...8pm I think, then that check in tent is open until like midnight. It's at the back of the parking area just before entering the camping area. You'll have to check their website for the various prices.
You can go now. They close doors at 7pm.
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