November 3rd is called "the Culture Day"; one of the national holidays.
Before World War the Second, this was the holiday to celebrate the Meiji Emperor's birthday.
After World War the Second, the Constitution of Japan was proclaimed on the 3rd of November, 1946.
6 months later, on the 3rd of May, the Constitution of Japan was enforced and it is the national holiday as well.
This season is the mid of Autumn and trees and leaves are changing their colors, not so many but some trees feel the atmosphere of Autumn coming.