Entry to the 2026 event was restricted at about 9:40am when it reached full capacity.
The annual event at Tokyo's Yasukuni Shrine is a great way to enjoy sumo without the cost of a ticket - entrance is free!
Like the other promotional tours called a jungyo, the competitions don't mean anything and the matches clearly lack any intensity. But the wrestlers seem to be in a cheerful mood and they can be seen smiling even moments before their match is scheduled to begin - something that is unimaginable in a real tournament.
In addition to the matches, the event features Sumo Jinku, the type of folk singing that is commonly featured in regional tours and also Shokkiri, a comical explanation of sumo rules.
The rough schedule of the 2026 event is on the Yasukuni Shrine website (in Japanese only)
https://www.yasukuni.or.jp/news_detail.html?id=676
Doors open at 8:30, the event starts at 9. The matches featuring the wrestlers of the top division is held from 2-3pm.
Update March 27: This year the shrine will be accepting a max of about 4,000 people. In previous years, this number was 6,000.
The sumo ring is on the northwestern corner of the shrine. The closest station will be either Ichigaya or Kudanshita. This is an outdoor event. If there is rain but it is only a drizzle, the event will still be held.

A rough timetable (based on previous years)
8:30 gates open
9:00 event starts with a ring purification ceremony
9:30 practices start
11:00-12:00 no events
12:00-matches of the lower Sandanme category wrestlers start
13:30-the top Makuuchi division wrestlers visit the main area of the shrine...if you could not manage a spot inside, you will be able to watch participating top ranked wrestlers head to the main shrine to offer their respect to the spirits that are enshrined at Yasukuni.
13:45 top division wrestlers appear on the ring
15:00 event finishes.
Some participating wrestlers will catch a taxi from outside the shrine, so this is another chance to see them up close.
Entry is not possible from around 1:00-1:30pm while the wrestlers do a roundtrip between the venue and the main shrine. Also when the viewing area reaches full capacity, the gates will be closed. In 2023 and 2024, there was still some standing space at the very back in the afternoon. However for 2025, entry was closed off after about 10am when it reached full capacity.
Information on seating
One side of the ring is reserved for those with special invitations only.
All other areas are non-reserved, and available on a first-come basis. The areas in the front consist of grass while the back features staged seating in concrete.
"Hanamichi" is the passageway for the wrestlers. Before or after the match, many of them will pause for photos or even sign autographs.
The area near the toilets will have some shades thanks to the trees in the back, but all other areas will be completely exposed to the sun.
There is some food and drinks sold inside but options are rather limited. It is ok to bring in outside food.
The area behind the food/drink stalls will have a limited view of the ring so you will want to find other areas to sit or stand.
Photo 2 was taken from the grass area (Covered by plastic sheets on the day of program).
Shoes need to be taken off to enter this area. While it is very close to the action, sitting can become difficult after a few hours. The lack of an angle makes it hard to catch the action happening on the far side of the ring.
Photo 3 If you don't mind standing, there might be empty space behind the last row of the concrete seats in this section even if you are a bit late to the scene. The higher vantage point allows for a clear view of everything happening on the ring. Only negative is that the sun will constantly be in the direction of the ring if it is sunny.

My experience from 2024 and 2025
2025: Denied entry...
I had some things to do in the morning so visited the shrine at about 1:30pm. The previous year I had managed to find some standing space at the very back around the same time.
Unfortunately things didn't go as planned as I was met with shouts from the security staff that entry is not possible...
There were around 100-200 people already in line, many of them foreign visitors. It seems there is more recognition of this event resulting in a bigger turnout. (The weather was also perfect, likely contributing to the big crowd)

2024...Sneaked in around 2pm and enjoyed the cherry blossoms also...
The 2024 event was held on April 15 (Mon). This year the cherry blossoms came a bit late and the petals were falling as the matches took place, making for a very beautiful scene.
The temperature reached 27 Celsius (80℉), extremely high for April so there was a constant announcement for spectators to be careful of heat stroke.