Día de Muertos (Day of the Dead) — November 1-2: Mexico's most important festival celebrating deceased loved ones with colorful altars, marigolds, sugar skulls, and traditional foods. Parades and cultural events throughout the city. Historic sites display elaborate installations.
Carnaval — February/March: Pre-Lenten celebrations with parades, music, dancing, and street parties throughout the city. Especially vibrant in certain neighborhoods.
Independence Day — September 15-16: National holiday celebrating Mexican independence with parades, concerts, and flag-waving. The Grito de Dolores ceremony at Palacio Nacional draws massive crowds.
Christmas & New Year — December-January: Religious celebrations, Christmas markets, Las Posadas processions. New Year celebrations in major plazas and nightclubs.
Benito Juárez Birthday — March 21: National holiday honoring the beloved former president with celebrations and closures of some attractions.
Other Events: International Film Festival (August), Viva México Festival, Art Fair Mexico (contemporary art), numerous neighborhood fiestas honoring patron saints.