The provincial calendar is anchored by national holidays, religious observances, and major cultural festivals.
* **Cultural Festivals:** The Fajr International Festivals (encompassing Film, Theater, and Music) are held annually in February to mark the anniversary of the 1979 Revolution, drawing international artists and massive local crowds. * **Book Fair:** The Tehran International Book Fair, held annually in May (often at the Mosallah or Shahr-e Aftab), is one of the largest publishing events in the Middle East, attracting millions of visitors. * **Traditional Celebrations:** Nowruz (the Persian New Year in March) sees the province empty out as residents travel, but those who stay enjoy pollution-free skies and public celebrations. Yalda Night (the winter solstice) is celebrated warmly in homes and cafes, while the somber religious processions of Ashura and Tasu'a see massive street gatherings and the distribution of free food (Nazri).