I don't either but the other day my husband was flipping through the channels and caught a bit of the Grammy's. "Look at these idiots wearing masks," he says. Now you know damn well the minute the camera was off so were their masks. As for masks while filming, I've seen shows say that they were all testing cast and crew multiple times each week. Probably back when tests weren't available for us common folk, they were all given to Hollywood royalty.