The Ceremony of Tri-yampawai (Tamil:திருவெம்பாவை (for Shiva) and திருப்பாவை (for Vishnu)) or the Swing Ceremony was one of the 12 royal ceremonies held in each of the months of the Thai lunar calendar in the Sukhothai kingdom. Originally held in the first lunar month, it was moved to the second lunar month in the early Rattanakosin period at the beginning of the 19th century. The ceremony was a Brahmin new year's ceremony and lasted for 10 days.
According to an ancient Hindu epic, after Brahma created the world he sent Shiva to look after it. When Shiva descended to the earth, Naga serpents wrapped around the mountains in order to keep the earth in place. After Shiva found the earth solid, the Nagas moved to the seas in celebration. The Swing Ceremony was a re-enactment of this. The pillars of the Giant Swing represented the mountains, while the circular base of the swing represented the earth and the seas. In the ceremony Brahmins would swing, trying to grab a bag of coins placed on one of the pillars.