15 consecutive days, three times a year the arena bustles. The three grand tournaments held in January, May and September celebrate japanese Sumo wrestling in the Ryōgoku Kokugikan. The growing popularity of Sumo during the Meiji period led to the building of the original Kokugikan in Ryōgoku in 1909. Today's sumo stadium, the Kokugikan, is the fourth built in Tokyo and has been in use since 1985. It seats over 10,000 visitors.