1, the ninth day of the ninth lunar month, is the traditional Double Ninth Festival, also called "Old People's Day". Because the Book of Changes defines "six" as the yin number and "nine" as the yang number, on September 9, the sun and the moon are combined with yang, and 29 is the most important, so it is called Chongyang, also known as Jiujiu. The Double Ninth Festival was formed as early as the Warring States Period. In the Tang Dynasty, the Double Ninth Festival was officially designated as a folk festival, which has been inherited ever since. The name of "Double Ninth Festival" was recorded in the Three Kingdoms period. According to xelloss's "Nine Days and Zhong You Book", "Year to month, suddenly September 9th. Nine is the number of yang, and the sun and the moon coincide. It is well known and considered suitable for a long time, so it is a feast. "

2. First of all, there is a custom of climbing on the Double Ninth Festival. In autumn and September, the sky is crisp. In this season, climbing into the distance can achieve the purpose of relaxation, health and illness. The custom of eating Chongyang cake is related to mountain climbing. Gaohe cake is homophonic. As a holiday food, it was originally to celebrate the harvest of autumn grain and taste new grain. After that, the people have the auspicious meaning of climbing to eat cakes and climbing step by step.

3. The Double Ninth Festival has always had the custom of appreciating chrysanthemums, so it was also called Chrysanthemum Festival in ancient times. September of the lunar calendar, commonly known as Chrysanthemum Month, holds a chrysanthemum party on holidays, and people from all over the city go to the meeting to enjoy chrysanthemums. Since the Wei and Jin Dynasties in the Three Kingdoms, it has become fashionable for Chongyang parties to drink and enjoy chrysanthemums and recite poems. In the ancient customs of Han nationality, chrysanthemum symbolizes longevity. The custom of inserting Evodia rutaecarpa was popular in ancient times, so it is also called Cornus Festival. As a medicine, Cornus officinalis can make wine, strengthen the body and get rid of diseases.