I can conform that. At end of August when passing by in the w evening ( 10 p.m. ish ) I noticed door opened so decided to peek inside, there was nobody, no staff , no boys , no customers but yes somebody opened it and also closed as next day's noon door were locked. Sing said ' show 23.30" so it's perhaps true they have only show with visiting boys to perform in it.
So brall3, no need to get upset since as you see , giving 'yes' or ' no" answer is not that simple