The Dutch calendar is marked by vibrant, highly participatory public celebrations.
* **King's Day (*Koningsdag* - April 27):** A national holiday celebrating the monarch's birthday. The entire country dresses in orange, and cities turn into massive open-air markets (*vrijmarkt*) and street parties. * **Amsterdam Dance Event (ADE):** Held in October, it is the world's leading electronic music festival and conference. * **Sinterklaas (December 5):** The traditional winter holiday where Sinterklaas and his helpers deliver gifts to children, predating and influencing the modern concept of Santa Claus. * **Keukenhof Tulip Season:** March through May, drawing millions to see the blooming spring flowers. * **Nijmegen Marches (*Vierdaagse*):** The world's largest multiple-day walking event, held every July, drawing over 40,000 global participants.