What does the Cold Food Festival mean?

Cold food festival means eating cold food as a holiday.

Cold food festival, also known as "no smoking festival", follows the ancient habit of changing fire. In early spring every year, the climate is dry, not only the kindling preserved by people is easy to cause fire, but also the occurrence of spring thunder is easy to cause mountain fires. In this season, the ancients held a grand sacrificial ceremony to put out all the fires handed down from the previous year, that is, "no fire." In this period when there is no fire, people must prepare enough cooked food and live on cold food. This is the so-called "cold food", hence the name "Cold Food Festival".