Who is celebrating the Double Ninth Festival in memory of?

In memory of the dead. 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. On May 20th, 2006, this folk custom was approved by the State Council to be included in the first batch of national intangible cultural heritage list. Every year on the ninth day of the ninth lunar month. The Double Ninth Festival is also a festival for the elderly, also known as the "Ascending Festival". Old people don't go to work at home, which is not included in legal holidays, so there is no holiday. Advocating the whole society to establish an atmosphere of respecting, respecting, loving and helping the elderly, the Double Ninth Festival has a new meaning. You can climb mountains, visit graves to worship ancestors, enjoy chrysanthemums, eat Ciba, Chongyang cake, bake fruits, drink chrysanthemum wine, insert dogwood and chrysanthemum. Stay at home with the elderly or take them out to play. Today, it's Chongyang again. Every year, the yellow flowers everywhere are particularly fragrant.