As part of a 120 voice choir in the 80's, the biggest gig we ever had was singing a pregame show for the Detroit Pistons when they used to play at the Pontiac Silverdome. We set up behind the curtain. You can see some of the curtain in the upper right corner of this photo https://www.flickr.com/photos/aaroncaldwell/2171980139
We didn't say my at that game but it was the best photo I could find of the curtain.

Our PA was meager. Definitely not suited for that size space. Scaffolding was already set up a couple stories and the staff of the Silverdome was supposed to put our dinky Bose 801 main speakers up on top of the two story scaffolding to each side of our stage.

The speakers had pole mounts on the bottom, and in order to aim them up into the stands the staff left the pole mounts on them so that they angled up.

We learned in the worst way that they did not anchor them down. Being teens and on the floor of the Silverdome, one of the guys brought a football and we were passing it around after our sound check, bumped the scaffolding and set one of the 801's rocking to where it fell off the scaffolding and shattered to smithereens on the floor of the Silverdome.

Those things were built like tanks but they weren't designed for a 20' drop onto concrete. All that was salvagable were the magnets.

So, we had even less firepower for the concert than what we brought. The echo in that place made it really hard to perform.

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