Chrysanthemum Day or Kiku no Sekku in Japan
Chrysanthemum Day or Kiku no Sekku in Japan is held on September 9. This event in the first decade of the month September is annual. 
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The month of September in Japan's lunar calendar was a time when chrysanthemum flowers bloomed. These flowers were said to bring longevity, so the festival was also called Kiku (chrysanthemum) no Sekku. It is said that chrysanthemum flowers were displayed and feasts wishing for long lives used to be held on this day.
Chōyō no Sekku is 1 of the 5 seasonal festival that originates from Inyō Gogyo Setsu. Before modern times, this took place on the 9th day of the 9th month based on the inreki. One of the reasons is that according to auspicious readings in ancient Chinese philosophy, odd numbered days are viewed as lucky, while even numbered days are seen as unlucky days. Since 9 is the highest single-digit odd number, Chōyō no Sekku was designated on this date. After Japan adopted a more modernized calendar, this date was changed accordingly by about a month, and takes place on a different day each year within that month.
Similar holidays and events, festivals and interesting facts
Bed Day in Japan on September 3
Softbank Day on September 3
Emergency Day in Japan on September 9 (Kyukyu No Hi);
World Headache Day on September 12 (A Day of Awareness and Support);
Fist of the North Star Day on September 13
Respect for the Aged Day on September 15 (Japan, celebrated on the third Monday in September);
Island Language Day on September 18 (Okinawa Prefecture, Japan)