Which holiday is depicted in Du Fu's poem Nine Days

In traditional Chinese culture, the Ninth Day is the ninth day of the ninth month of the lunar calendar, which is also known as the Chongyang Festival. This festival is characterized by the customs of climbing high, enjoying chrysanthemums, drinking chrysanthemum wine, and wearing dogwoods, which signifies a long and healthy life and protection from evil spirits and disasters.

In Du Fu's "Nine Days", its describes the scenes of the Chongyang Festival, including autumn scenery, chrysanthemums, drinking wine, etc., as well as his own moods and feelings during the festival.

The two lines of the poem "Drinking alone in a cup at the Chung Yeung Festival, and climbing up the river on the platform when I am sick" emphasize the atmosphere of the festival and the poet's feelings.