Phi Ta Khon (also spelled Pee Ta Khon) is the Ghost Festival. Over three days, the town's residents invite protection from Phra U-pakut, the spirit that lives in the Mun River, which runs through Dan Sai. People in the town and surrounding villages wear costumes made of patchwork and ornate masks and are thought be ghosts who were awoken from the dead when Vessantra Jataka (one of the Buddhas) came out of the forest.