In Lao PDR Boun Ok Phansa or Lai Hua Fai is celebrated at the end of the rainy season. It is held on the full moon day of the 11th lunar month with fabulous festivities along the Mekong River in Vientiane, such as ลอยกระทง boat races and และไหลเรือไฟ.
After three months retreat during the Bhuddist lent, the monks return to their social duties and are welcomed with offerings of food and gifts.
Before the festivities begin, everyone cleans their home to rid bad spirits which may have taken up residence during the rainy season. Families then walk down to the river carrying beautifully carved wax candles in the shape of temples or boats, which they light and set adrift on the mighty Mekong, a ceremony which is thought to give the person releasing the craft very good karma for the coming season.
The festival always takes place on the ten days leading up to, and including, the October full moon.