Double Ninth Festival of Chinese

Today is the 9th day of the Lunar Calendar , the Double Ninth Festival, which is translated into Chongyang Festival or Double Ninth Festival in English.
In the ancient Yijing, the "six" was set to the negative number, and the "nine" was set to the positive number. On September 9th, the sun and the moon were both yang, and the two were nine, so they were called Chongyang, also called Chongjiu, the ancients thought it is a geeky day to worth celebrating, and starting this festival since very early.
In 1989, China set the September 9th of each year as the festival for the elderly. The tradition and modernity were skillfully combined to become a festival for the elderly, respecting the elderly, loving the elderly, and helping the elderly.
The most well-known custom of the Double Ninth Festival is Climbing Heights. Besides, what else customs?
Wearing cornel twigs /Dogwood
Enjoying chrysanthemum flowers
Eating Double Ninth cake
Drinking chrysanthemum flower wine
Climbing heights
Family get-togethers