The Full Moon Party is a beach party held on every night where there is a full moon . It was held for the first time in 1985 and was held at a wooden disco not far from the beach to thank travellers for coming to Ko Pha Ngan island in Thailand . The Full Moon Party is an all-night beach party that takes place in Haad Rin on the island of Ko Pha Ngan , Thailand on the night before or after every full moon .