While not even remotely a metal band…
I saw Underoath at a small local venue years ago that basically did this. Prior to the “open the pit part” they announced that the owner told them no encouraging moshing or it’d forfeit their payment. Being that the band told us that prior to the “open the pit” part they obviously knew what they were asking for and welcomed it. They were pulling the crowd up on stage to dive off and everything. The venue cut the mics and they kept going to finish the song. It was absolutely amazing.
