Limestone night in the municipality of Briel, Netherlands
Limestone night in the municipality of Briel, Netherlands is held on April 1. The Kalknacht commemorates the victory over the Spaniards of the Duke of Alba in 1572. This event in the first decade of the month april is annual.
Easter in Western Christianity on April 4 (Første påskedag in Norway);
Easter Monday on April 5 (Påskedag in Norway);
Dutch-American Friendship Day on April 19 (United States);
King's Day on April 27 (Netherlands, Aruba, Curaçao, Sint Maarten. Celebrated on April 26 if April 27 falls on a Sunday);
Remembrance Day in the Netherlands on May 4 (it was observed for the first time on May 4, 1946. Every year, people dedicate two minutes of silence at 8pm (local time) on May 4 to pay their respects to soldiers and civilians who died during World War II, as well as other military conflicts and peace-keeping missions);
Liberation Day in the Netherlands on May 5 (Soon after the Second World War, it was decided that Liberation Day should be held on 5 May, the date of the German army’s defeat)