What's the festival for grandparents?

The ninth day of the ninth lunar month is a traditional festival in China-the Double Ninth Festival. Double Ninth Festival, also known as "Old People's Day", is a festival for our grandparents.

Double Ninth Festival, the ninth day of the ninth lunar month, is called "Double Ninth Festival". There are six Yin and nine Yang in the post-Ye Confucian view of Yin and Yang in Hanzhong. Nine is the number of yang, and the real nine is also called "Chongyang". People have the custom of climbing mountains on that day, so the Double Ninth Festival is also called "Mountaineering Festival".