Playing in dance clubs in New York, we see this nonsense all the time.
If the club owner cannot guarantee the safety of your equipment and the band members, I would not play there -- it's in the contract.
Also, when this nonsense starts, we immediately STOP playing. Unfortunately, music seems to add fuel to the alcohol fire and dead silence seems to quiet things down. We also threaten to walk off stage if the nonsense doesn't stop.
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Al
Pa4x - LD Systems Maui 28 - Mackie Thumps