Three Ghosts Day refers to

Sanming Festival refers to Tomb-Sweeping Day, Zhongyuan Festival and Han Festival, three traditional festivals of the Han nationality. These three festivals are dedicated to ancestors, dead relatives and other ghosts, so they are collectively called Three Ghosts' Day.

Tomb-Sweeping Day is one of the important traditional festivals in China, and it is also a 24-solar term, usually on April 4th or 5th of the Gregorian calendar. The fifteenth day of the seventh lunar month is also called the Mid-Autumn Festival. In some places, it is usually called Ghost Festival and Stone Drum, and it is also called July and a half. The first day of October in the lunar calendar is the Cold Clothes Festival. On this day, special attention is paid to paying homage to those who died first, which is called sending cold clothes.

The Relationship between Tomb-Sweeping Day and Cold Food Festival

In ancient times, the day before Tomb-Sweeping Day was called "Cold Food Festival". According to legend, in the Spring and Autumn Period, when Jin Wengong was in trouble, Jiexiu cut his own meat to satisfy his hunger. After Jin Wengong acceded to the throne, Jiexiu was invited to be an official, but Jiexiu lived in seclusion in Mianshan. Jin Wengong asked Yamakaji to try to force Jiexiu out, and Jiexiu was burned to death by mistake.

Jin Wengong regretted it very much and ordered that fire should be banned from now on. Because of the fire ban, people can only eat cold food on this day, so it is called "cold food". After that, cold food and cold food gradually merged into one, which was followed from generation to generation and became a traditional festival of the Chinese nation.