The Cold Food Festival.

The meaning of the phrase "Spring City is full of flowers, and the east wind of the Cold Food Festival is blowing the willow branches of the royal gardens" is:

In the late spring, the willows were fluttering everywhere in the city of Chang'an, and there were countless red flowers, and the east wind of the Cold Food Festival was blowing the willow branches of the royal gardens.

The date of the Cold Food Festival is just one or two days before the Qingming Festival, and the custom of the Cold Food Festival was at first not to make fire to make food, but only to eat cold food prepared in advance, cooked food, so it was named "Cold Food Festival", and the cold food is also referred to as cold food. But in the subsequent thousands of years of historical development, gradually added trekking, sweeping, swinging, cuju and other customs.

The Cold Food Festival originated in the Spring and Autumn Period, when Jie Zhi Tui was burned on Mianshan Mountain in Jiexiu. Duke Wen of Jin ordered a ban on fire and cold food on the anniversary of the death of Jie Zhi Tui, so as to send condolences to the cold food. By the time of the Tang Dynasty has formed a national legal holiday, later combined with the Qingming Festival, is the earliest of the traditional Chinese festivals.