Songkran Pattaya - Wan Lai Festival Pattaya is on 19 April of every year. Songkran Celebrations in Thailand will be last from 5-20 April. Wan Lai Festival Pattaya is an extraordinary Songkran Festival in Pattaya that will be held a week after Songkran Festival. This is another great chance for you to get full fun of water festival after the end of Songkran Celebration in some parts of Thailand.