Chrysanthemum Festival(Septebmer 9)
September 9 is known as choyo, literally double yang. Choyo is one of gosekku , the five seasonal festivals and also called as kiku no sekku , Chrysanthemum Festival.
According to the yin and yang thought, odd numbers are yang, and its extremity is nine. Therefore September 9 is 9.9 and double yang, double nine.
People used to decorate chrysanthemum and drink sake floating the petal of chrysanthemum to celebrate wishing the long life.