The Kumamoto version of the Sumo Run For Fun event described here

http://www.asahi.com/ajw/articles/AJ201707310023.html

will be held on October 22nd in Minami Aso. It seems that you need to pay 6000 yen to cover both entry and costume fees.

– Kirk

https://irorio.jp/nagasawamaki/20170923/418564/