Because there is one party that gravitates to that solution.
Regarding your Q, for me.....it would depend on my risks and on those of the rest of the band members. No amount of mask wearing and distancing will avoid an increased risk.
But on the other hand, you cannot live your life in fear from now on which is being encouraged in the media.
This virus has a very small chance of killing you just as many other things already did.
The odds of dying from COVID aren’t that much different than having a stage accident, and that never stopped you before.
But since there are others in the crowd to think about,even if you decide to do it, I would rec that you guys get tested yourselves so that you minimize the chance of exposing others in that setting.