It is the biggest festival of Giay people, held on the Dragon day of the first lunar month every year. The festival means to pray for a bountiful harvest, prosperous people, and favorable weather. The venue was a field in front of the village.

The festival consists of two parts: the ceremony and the festival, in which the ceremony is the ritual of worshiping, dedicating the offerings and praying to the gods. The festival consists of folk games such as archery, stilts, plowing competition, tug of war, etc. Especially "ném còn" - a ball-throwing game - is also considered a typical contest, featuring both religious and cheerful natures to Roóng Poọk Festival of Giay people.