Spring City is full of flying flowers. Cold food, east wind and willows slanting refer to what festival?

Qingming Festival

Cold Food

Flowers are flying everywhere in Spring City, and the east wind of Cold Food keeps the willows from slanting.

At dusk, candles were passed down from the Han Palace, and light smoke dispersed into the house of the Five Marquises.

[Note]

1. Cold food: the name of the festival, two days before Qingming. During this festival, the ancients did not light a fire for three days before and after, and only ate cold food, so it was called "cold food".

2. Royal Willow: Willow in the Royal Garden.