I haven't, but I'm not an expert. I do know that the theaters were closed for about 7 to 10 days up until ~July 17th or July 18th. But I'm thinking that they are open again. I feel like the Swine Flu (a.k.a. "Porcina", a.k.a. "H1N1", a.k.a. "Gripe A") hysteria has died down a bit. Whether it should have died down or not, I don't know, but I think that people are getting past it. But that might be because all of the schools are closed right now.
Theaters have cancelled concerts during the month of July, but the milongas continue as usual. I haven't heard of any being closed because of the flu. Attendance is down because tourism is down during winter.
I went dancing on Friday night and Sunday evening at my regular place. Attendance was normal.