Chongyang Festival or the Double Ninth Festival is held on the ninth day of the ninth month under the Chinese lunar calendar. It is traditional on this day to climb mountains and to celebrate by admiring chrysanthemums which bloom luxuriantly at this time of the year, drinking chrysanthemum wine and eating chrysanthemum cakes. It is also traditional to pay one's respects to the elders on this day.
More about this festival: Double Ninth Festival