Koningsdag or King’s Day is a national holiday in the Kingdom of the Netherlands. Celebrated on 27 April (26 April if the 27th is a Sunday), the date marks the birth of King Willem-Alexander. Until the abdication of Queen Beatrix in 2013, the holiday was known as Koninginnedag or Queen’s Day and was celebrated on 30 April.
Koningsdag sees large-scale celebrations, with many concerts and special events in public spaces, particularly in Amsterdam. An outdoor concert is held on Amsterdam’s Museumplein, where as many as 800,000 people may gather.
Those taking part in Koningsdag commonly dye their hair orange or wear orange clothing in honour of the House of Orange-Nassau, which rules over the Netherlands. Orange-coloured drinks are also popular. This colour choice is sometimes dubbed “orange madness”, or in Dutch, oranjegekte.