You may claim that you're disappointed with the staff and service at the HoB, but the fact still remains that you tried attending a concert you didn't meet the age requirement for, when you knew full well what the required age was. When I was 15 I didn't try to get my license on the off chance that the DMV would let me, even though I know the age requirement is 16...

As for the staff, there's a curfew for the city, there was the issue with the alcohol license, there was the simple fact that it was clearly marked what the age requirement was and I'd imagine you standing in line knowing you're underage is a waste of time for the staff to deal with.