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 Day and was celebrated on 30 April.
There are large scale celebrations across the country with a lot of locals and tourists celebrating in Amsterdam. There is a sea of orange along the canals of Amsterdam as people drink and party through the day and night.
An outdoor concert is held on Amsterdam’s Museumplein, where as many as 800,000 people may gather.