Double Ninth Festival, the ninth day of the ninth lunar month, is called "Double Ninth Festival". People have the custom of climbing on that day, so Double Ninth Festival is also called "Climbing Festival". There are also sayings such as Double Ninth Festival, cornus and Chrysanthemum Festival. Because the homonym of "Jiujiu" on the ninth day of September is "for a long time" and has a long-lasting meaning, ancestor worship and activities to respect the elderly are often carried out on this day. The Double Ninth Festival and the three festivals of "Chu", "Qing" and "Yu" are also the four major festivals for ancestor worship in traditional festivals in China. 20 12 years 128 February, the law clearly defines the ninth day of the ninth lunar month as the festival for the elderly.