That photo is from March 2016 and I had the luck to get a ticket for the Sumo March Tournament in Osaka. This was the arrival of the senior wrestlers around 2/3pm. It was an amazing experience I can only recommend. But be careful there is a Sumo schedule and the tournament travels from city to city, month by month and it’s only every second month. Check this http://www.sumo.or.jp/EnTicket/year_schedule