The 25th day of the first month of each year is the Bunker Filling Festival, which is said to be the birthday of Prince Cang. This is a folk festival in China, symbolizing the bumper harvest in the new year.

The "Warehouse Filling Festival" is also called "Tiancang Festival" because of the homonym of "filling" and "sky". There are two kinds of warehouses in Xiaotian. The 20th day of the first lunar month is Xiaotian Cang, and the 25th day of the first lunar month is God Cang, which is a traditional folk festival.

Some people say that Tiancang Festival is a day of offering sacrifices to stars, while others say it is a day of offering sacrifices to the earth or grinding the gods. The so-called warehouse filling is to fill up the barn.