There is typically A LOT of traffic as you get within 5 miles of the venue. It can take a while just to park your car. The time you arrive depends on you. There's typically opening bands that come on and the headliner will come out after sunset. There's no way to know in advance.
you can pay 60$ and park close and leave first or free parking is 5 to 10 min walk.
That will depend on the event, some people arrive super early and tailgate, but the entry process is pretty straightforward and quick
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