People who want to go to a milonga (freely spoken: a tango party) meet at 22:30 hrs in the lobby. We will walk about twelve blocks to a nice little place called "La Rada", Jujuy 1673. AFAIK, at the same place is a tango class at 20:00 hrs, if you are enthusiastic. The entrance fee of the milonga is probably 5..10$ (pesos). It lasts til ~1:30 hrs.