Songkran is a festival held every year in Thailand on April 13. This is Thailand's New Year's party. It celebrates the traditional New Year in the Thai calendar. The festival lasts all over the country for 3 days. However, in the northern city of Chiang Mai, it is six days. Long ago, Thai people used a different calendar from other places in the world. Their year started around April 13. Now, their year starts on January 1, but they still celebrate the New Year from April 13 to April 15. 