the second picture - Mongolian performance, the last two pictures - 傣族 Dai people's 泼水狂欢. Pouring water to each other, it is part of Dai people's custom. 泼水节 poshui festival is one of Dai people's tradition. It was celebrated on the 7th day after Chinese 清明,which is from 13th. April to 16th. April. This is clean away, sweep away the bad luck of the last year, and to welcome upcoming ne