The reports I can see don't mention dancing, but I think they're all AP, or rewrites thereof. Dancing can collapse buildings, but you'd have to try really hard.

A few years back, we were going over choreography in a upstairs hall, and brought a 10 foot circle of the ceiling down in the room below. As this was thick Victorian plaster from a ceiling about 20 foot up, not a good thing rto be underneath.

We had been assured that the room was used by line-dancers twice a week, and this had never happened before. We must just have been in time better, and dancing at the correct tempo to hit a resonance frequancy of the floor... I think the point I was trying to get to is that there are likley to be some warning signs if some you're doing is about to collapse the building.