I think it is a very personal decision about how we navigate these times and dependent on a host of factors. People at greater health risk ought to be more cautious. I don't go to dance parties, but if I did, my decision would be made on how the community transmission is going, how big the room is, what the ventilation is like and how many people are there. Also if it is a "regular" crowd versus new people all the time. I think we are all creatures of habit, in terms of where we go, who we are near and now, what our COVID habits are. I would wait and see how the others fared for 3 weeks or so and then, if there was no outbreak, I would think the risk would be acceptably low for me (but it is low in my city at present). Dance studios here are holding classes again. My husband went back to soccer and when the guys were the known regulars, he felt safe enough even though it is a contact sport. Now people he doesn't know are coming out of the woodwork to join and so he will not go back until the numbers are reduced. As Bonnie Henry says: "fewer faces, larger spaces". BTW, there is interesting research that the MMR vaccine can reduce the severity of COVID. Have booked the family to get boosters next week.