September Calendar 2025 Japan. Sumo schedule (2024 & 2025) professional sumo has 6 championships each year that are known as honbasho.honbasho are major sporting events that span 15 days. That said, you can start planning your visit by referencing the dates for.

These dates may be modified as official changes are announced, so please. Dates of all holidays and celebrations in the calendar for 2025.