There is a chrysanthemum festival on September 22-October 13 in Japan. Many dress in robes completely covered with mums. The chrysanthemum is found on several royal flags--not the national flag.
These are fall flowers. When the perennials and annuals begin to die away it is time for mums.
A great festival is held in the Dallas, Texas area related to the Texas Homecoming Mum. These mums are not only the very large blooms but they are decorated in the most elaborate ways including tiny lights, gold and silver ribbons, etc.
In Malta chrysanthemums are associated with funerals and are considered unlucky.