January 1: New Year's Day - parades and celebrations citywide. February: Carnival (movable) - street parties, costumes, and music in neighborhoods.
April 2: Falkland Islands Memorial Day - military ceremonies and patriotic events. May 1: Labor Day - marches and political demonstrations in Plaza de Mayo.
June 20: Flag Day - ceremonies and patriotic celebrations. July 9: Independence Day - one of the biggest celebrations with parades, concerts, and fireworks.
August: Buenos Aires Tango Festival - performances throughout city, from Teatro Colón to street venues. Free and paid shows.
September 21: Spring Equinox - beginning of spring celebrations. October 12: Columbus Day - cultural and indigenous heritage celebrations.
November 17: Buenos Aires Gay Pride Parade - one of South America's largest pride celebrations with massive parade down Avenida 9 de Julio.
December 25: Christmas - celebrated as summer holiday with outdoor gatherings and beach/park activities. December 31: New Year's Eve - massive celebrations in streets, especially around Obelisco.