Just back from a concert at Indoor Stadium and shot with the Fujifilm S602Z and Nikon SB80DX. Learnt that they have rather funny rules....
1. cameras that look professional are not allowed (first of the duty staff told me mine's looked professional and may not be allowed);
2. long zoom lens not allowed (someone told me to "reduce" my zoom when I had the B300 attached. He didn't know that I can't "pull back" the teleconverter. Also threatened to confiscate my roll of film-does he have the right?);
3. big attachments also not allowed (a few other duty stuff frowned upon my attached B300).
But camera with external flash is allowed. I initially thought that a big external flash would be frowned upon but not so Had to fire off the flash at full power, else can't reach the singers (I was seated maybe >20m from the nearest part of the stage)