The Ban Flower Festival consists of a ceremonial part and a festive part. In the ceremonial part, the “Xen Muong” festival is performed by elderly artisans with the “Tam Te Then” ritual, reporting and inviting the gods (8 Then) in heaven and the gods who govern the mountains and rivers in the lower world (muong lum) to join in the Ban Flower Festival and enjoy the delicious dishes made by the local people.

The annual "Xen Muong" festival is an opportunity to express gratitude to the gods and those who have contributed to the discovery, construction and protection of the hamlets. It also aims to pray for peace, good weather, bumper harvests, and favourable business. It has become a unique cultural feature of the ethnic community in Son La city.Immediately afterwards, at Dong Xen Park, the city leaders offered incense, expressing their gratitude to the gods and ancestors.

At Dong Xen Park, the city leaders expressed their gratitude to the gods and those who have contributed to the exploration, construction and protection of the hamlets, while also praying for peace for all people in Son La city, good weather, and bountiful harvests.