My wife got covid at Roanoke Railroader last summer and I got it from her.
I researched then (so relevant to variants then, not necessarily current variants)
and most transmission occurs 1 to 2 days before testing to 2 to 3 days after testing.
I don't know if that is relevant to this discussion because ...
I assume most people test when they start to feel different from normal health ...
which might explain the "1 to 2 days before testing" transmission
and that's different from a "test regardless of how you feel to dance" testing policy.
But, I do not know that. That just happens to be the data.

Turkey Quicky, a mini-weekend, fortunately escaped covid spread though
someone tested positive Saturday morning after dancing Friday night.
(most dancers were unmasked)
A KY weekend dance before TQ had a roughly 20% covid
spread with a recent negative test and a negative test on entry policy.

I'm not saying what policy should or should not be enacted to
prevent the spread of covid. I'm just noting one official statistic
and two recent weekend dances data points.

-Heitzso