Mychael Muircastle

More than likely the sim is always closed, since there was a concert going on it's possible that the sim owner opened it up for the event then closed it again; some sims are open to members only, but do open them on occassion for special events. It may not be a matter of something you did, but the fact that the sim is just closed to everyone that isn't in the land group & was just open at the time you were there for the event.