Copyright: songkran
Songkran (also known as Theravada New Year) is the splashy and water-filled New Year festival in Thailand, Cambodia, Myanmar, and Laos as well as in select parts of India and China. Songkran is celebrated on April 13th of each year according to the commonly used Gregorian calendar, and marks the new year on the Theravada Buddhist calendar.
(Source: Britannica)