I think it's some crazy, wacked out laws that dictate the age rules. It depends on whether the bar serves food, what type of liquor license they have, etc, etc...
For instance, there was this Howard Johnson Motel in Alabama that had a club in it, oddly enough. It was called the High Note, and they regularly had local bands play. They also had a bar. Many of the shows were all ages, however.
One day, they have an inspection, and they get a citation for having all ages shows and alcohol. So the next night, they turn off the bar, and cover it up. They get inspected AGAIN, and get another citation. Seems that it doesn't matter if the bar is closed or not. Just the presence of it caused the problem.
So the NEXT night, they're forced to suddenly make the show 18 and up, or risk losing their license. It was madness, because lots of people had come to see the show who were under 18.
So the laws are fucked up and complicated. That's all I'm trying to say with this incredibly unwieldy post.
By the way, The High Note made the best of a bad situation, and opened up the back doors so that every underage person who had come to see Pain
could stand outside and still watch the show. Actually this is where I first REALLY met my friends Colleen