Istanbul Tulip Festival (April): Millions of tulips bloom across city parks, especially Emirgan Park. Free, family-friendly, peak spring event.
Istanbul Music Festival (June): Classical music performances in historic venues. International orchestras and soloists. Tickets required.
Istanbul Jazz Festival (July): Two weeks of jazz, blues, and world music. Indoor and outdoor concerts across city.
Istanbul Biennial (Sept-Nov, odd years): Contemporary art exhibitions in venues citywide. Major international art event.
Ramadan & Eid: Holy month with special atmosphere. Many restaurants closed during day. Iftar (breaking fast) creates festive evenings. Eid celebrations follow with family gatherings and holiday atmosphere.
New Year's Eve (Dec 31): Major celebrations in Taksim Square, Istiklal Avenue, and along Bosphorus. Fireworks, parties, street celebrations.
Republic Day (Oct 29): National holiday celebrating founding of Turkish Republic. Parades, ceremonies, fireworks.