Boys’ Day (Dragon Boat Festival): May 5th. On this day, "carp streamers" are hung in front of the doors of families with sons to wish the boys healthy growth. In Japan, May 5th of the Gregorian calendar is the Dragon Boat Festival. "Carp streamer" means carp jumping over the dragon gate. Carp flags are hollow carps made of cloth or silk. They are divided into three colors: black, red and blue. Black represents the father, red represents the mother, and blue represents the boy. The number of green and blue flags represents the number of boys. The Japanese believe that carp is a symbol of strength and courage, expressing the parents' desire that their children and grandchildren will become brave and strong warriors.