Tango master class, exhibition, and Delfina Saravia birthday/Cumpletango 10-year celebration.
A guess
A late night: movement, a little warm-up shyness and then loosening up. Probably people who like to dance, beginners welcome to join in. In Buenos Aires people dine late and go out after 23:00.
A guess from the kind of event, the hour and the city, not from the organizer.
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