They have EVERYONE out of the building by a certain time on Friday night, then the place is VERY secure. I kept my windows down on my car overnight there last year.

You are allowed back in about 2:00 to prep your car. They start to judge at about 4:00 and they open the doors to the public at 5:00. The show ends at Midnight and as soon as they get all the spectators out of the building, they will open the rear bay door and allow everyone out.

You mist disconnect your battery. If you want power its about $75 for the 5 hours and you need a inverter hooked to the terminals of your car.

MAKE SURE you arrive with under 1/4 tank of gas or you will not be allowed into the venue.