Well, that varies from show to show. Generally speaking if you are one of the first 10 - 20 people in the door you will have your choice of spots. SO, for your Good Charlotte show that means 8 hours before doors. For DBT I am thinking that would be more in the ballpark of an hour prior to doors, maybe even less. You could swing by and check out the line and, if there isn't one, visit one of the other fine establishments in the neighborhood. Every once in a while take a look to see what the scene is in front of the club and when it looks like folks are gathering...head on over.