Called the stadium, lady said that yes the Bahrainians are allowed to bring in instruments. I said but it's in the rules that patrons can't bring them in. She then put me on hold (very grumpily) and another dude came on and said NZF had said it was ok for the stadium to allow the instruments as it's their event blah blah blah. They can bring in little drums (that must fit under their seat). But he also said during the game if enough people complained about the noise they would be told not to play them. He also said we could bring in drums if we wanted.
I still think it blows!