This is the biggest festival in Lang Son Province. It involves Tuan Tranh's palanquin procession from Ky Cung Temple to Ta Phu Temple to repay Than Cong Tai for his kindness. The procession includes group of people in color dresses and many kinds of flags, and canopies. There are many folk games such as human chess playing contest, lion dance, sli, and luon singing contests. The Luon singing (a style of singing of Nung, and Tay to wish their parents having a longevity life, thank to sky, and earth). The festival attracts many people.