The Double Ninth Festival, also known as the Chung Yeung Festival, is a traditional Chinese holiday celebrated on the ninth day of the ninth lunar month, observed in China, Taiwan, Hong Kong, and Macau. This festival is linked to the philosophical concept of yin and yang, with the number nine representing yang. To mitigate the potential dangers associated with the double nine, people engage in various customs such as climbing mountains, drinking chrysanthemum wine or tea, and wearing Cornelian cherry, which are believed to possess protective qualities. A significant aspect of the festival involves visiting ancestral graves to pay respects to the deceased, where individuals clean the graves, leave food offerings, and burn incense. In Taiwan, the day is also recognized as Senior Citizens' Day, emphasizing care and appreciation for the elderly.