Every year in the seventh month of the lunar calendar, the "Purdue Day" in Shishi villages comes one after another. On the first day of July, every household should "light a lamp", and everyone hangs such a "Purdue lamp" at their doorstep. At dusk that day, people put five kinds of dishes, wine and rice on the doorstep for sacrifice. On the first day of the eighth lunar month, there is a custom of "turning the lamp feet upside down".