yee-peang (ยี่เป็ง) Festival
The festival is present on night 15th month 2nd on the northern lunar calendar which on November or December of normal calendar. This is festival or lory gra-tong (ลอยกระทง) tradition is a tradition of Lanna people to make offerings to one's ancestors by making a vessel to put worshipful things, light the candles and joss-sticks, and launch their vessels flow with the water.
Besides, as doing the same thing as other Thai people in other area do, Northern people also have two kinds of floating lamp called koem-lory (โคมลอย) as a kind of launching into the day sky and a kind of launching into the night sky. The koem-lory is a vessel that can drift to the sky, especially ones that drift into the night sky is very beautiful with light.