BUENOS AIRES — Liliana Furió’s ruby red flat shoes glided across the dance floor in swift, assured moves, making her baggy pants sway gently.

Fiorella Paglione and Rodrigo Barraza dancing the tango in front of a restaurant in Buenos Aires.CreditCreditVictor Moriyama for The New York Times

She and a lean young Russian man were rapture personified, clasped in a tight embrace as they circled counterclockwise with a few other pairs in perfect synchrony. But it was hard to tell who was leading whom. Some pairs appeared lost in a loving embrace while others swung back and forth playfully.

And that is precisely what Ms. Furió had in mind when she created a weekly dance fest that would break all the rules of tango, Argentina’s prime cultural export.

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