What are the mythological origins of the Water-splashing Festival in tourism common sense?

Songkran Festival is an ancient traditional festival of Dai people. Water-splashing Festival is also the New Year of Dai calendar, which is called "Shang Jian" and "Shang Han" in Dai language, and it is a day to bid farewell to the old and welcome the new. Generally, it is held in the middle of June in the Dai calendar (about ten days before and after the Tomb-Sweeping Day in the lunar calendar). There is a touching story among the Dai people about the origin of the Water-splashing Festival.

According to legend, in ancient times, there was a god named Pengmadian Dalaza who was in charge of farming season. Dalaha, who holds pockmarked spots, with its clever magic, magical power and chaotic divine power, can do whatever he wants, rain whenever he wants, and cool down whenever he wants, making the world cold and warm, confusing rain and drought. Ying Da Tira, the Emperor of Heaven, decided to punish Dalachai, who brought disaster to the world, but because of his clever magic, the gods and immortals were afraid to touch him. So Ying Da Lati became a handsome young man and went to "string up" Madian Dalachai's seven daughters. He told them how their father did evil. Seven kind and beautiful girls were very dissatisfied with what their father had done. Today, after listening to the words of the "young man", I was even more indignant. They are determined to put righteousness above family interests and eliminate pests for the world. The girls privately discussed that in order to get rid of their heinous father, they must find out the secret of his life and death. Darachai, who was holding hemp, unconsciously revealed his secret of life and death in his laughter: he was afraid of fire, flood, knife cutting, arrow shooting, and making a bow with his hair (meaning "heartstring bow").

One day, the girls drank their father as drunk as a fiddler. While he was sleeping, they quietly pulled out one of his hairs and made it a "bow plug massacre". When they aimed the "bow stopper" at Dalachai with hemp, his neck was broken. As soon as his head landed, it caught fire and the fire spread everywhere. In order to put out the evil fire, seven girls took turns holding Dalachai's pockmarked head until it rotted. In the process of rotation, the girls should call clean water and splash it on themselves to wash away stains and odors.

In order to commemorate these seven girls, Dai people will hold water splashing activities during the Chinese New Year to eliminate disasters and solve problems, and wish the new year a good weather, abundant crops and prosperous people and animals. The "wrist brain" in the Dai calendar New Year is the day when Dalaza's head rots, and water splashing activities are held on this day.