Statistics on foreigners visiting the country most Thai In the Songkran Festival. The Songkran Festival is held on the day 13-April 15 of each year, which was the hottest summer in Thailand. The Songkran Festival is held on the day 13-April 15 of each year, which is a hot summer in Thai. The Thai people splash water put together across the country to put out the heat and create relevant in society.