The city's calendar is anchored by both deep-rooted cultural traditions and modern civic festivals.
* **Nowruz (Persian New Year):** In late March, the city experiences a beautiful quiet as many locals travel, while vibrant cultural festivities and traditional *haft-sin* displays dot the parks and squares. * **Fajr Festivals:** Held every February, this mega-event includes international festivals for film, theater, and music, drawing artists from across the globe. * **Tehran International Book Fair:** Held annually in May, this massive event draws millions of visitors and acts as a central cultural touchstone for the country. * **Religious Observances:** The month of Muharram, particularly Ashura and Tasu'a, features large, somber, and deeply communal public processions and street theater (Ta'zieh).