Double Ninth Festival, also known as Chongyang Festival, falls on the ninth day of the ninth lunar month every year.

It is a traditional Chinese festival that dates back over 2,000 years. The number 'nine' is considered auspicious in Chinese culture, and the ninth day of the ninth month is believed to have a special significance.

On this day, people usually climb mountains, enjoy chrysanthemums, and eat special foods like chongyang cake and chongyang dumplings. It is also a time for family reunions and paying respects to the elderly.

In recent years, Double Ninth Festival has gained more attention and recognition as a day to show appreciation for senior citizens. It has been designated as Senior Citizens' Day in China, and various activities and events are held to honor and celebrate the contributions of the elderly.

Overall, Double Ninth Festival is a time for reflection, celebration, and gratitude in Chinese culture.