My perspective on this type of activity at musical events is that it should never be allowed. Lets face it, if the band is so talentless that they cannot captivate their audiences without setting off fireworks, they shouldn't be on stage to begin with. I feel the same way about performers that need to be surrounded by half-naked women making provocative gestures to the singer. More often than not it's a song with less than four non-profane lyrics, and a total of 10 different words in the entire song.
Guess I'm getting old,
Gary
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K+E=W (Knowledge Plus Experience = Wisdom.)