Chakri Day in Thailand
Chakri Day commemorates the Chakri dynasty. The current King /HM King Bhumidol The Great/ is the ninth king of the Chakri Dynasty. The celebration includes royal ceremony with King Bhumidol paying respect to King Rama I /the first king of the Chakri Dynasty/. The Chakri Day Holiday is celebrated on April 6th. If the holiday happens to be in Saturday or Sunday the following two days are also public holidays.
See also
All the holidays and celebrations in Thailand