International Tango Festival The International Tango Festival unfolds the first week in December, hailing bygone Buenos Aires, while confirming that tango is very much alive in hearts of porteños (Buenos Aires citizens). Call +54 (0) 11 4312 5621 for more information. National Tango Day Tango reigns on the Dec. 11 birthday of tango great Carlos Gardel, packed with related events. Call +54 11 4378 7100 for more information. Polo Argentine Open As the world’s fifth oldest polo competition, this tournament first played in 1893 is a highlight of the polo circuit, unfolding at Camp Argentino de Polo en Palermo. Call +54 (0) 11 4372 3612 for more information.