During the night of the full moon, Thai people will float their Krathongs on the rivers or the canals for forgiveness of the bad things that they have done. They also thank Phra Mae Khongkha for their living. It is believed that the floating Krathongs will take their sins and bad luck away and create good luck.
The most beautiful and well-known celebration of Loy Krathong is at the Sukhothai province. This is where the festival started. On the night of the festival, there's a parade contest. There is also a beauty contest locally known as Nang Nopamas Contest during the festival.