Some might think that if you come to Tokyo, you can see Sumo Wrestling, but that is not the case.
Sumo tournaments are held in Tokyo in January, May and September; in Osaka in March, in Nagoya in July,and in Kyushu in November. They also have tours in between.
Before the tournaments, they move to neighboring practice place near each venue, so they would often be out of Tokyo.
Sumo is quite popular that they are usually full house. The tickets are extremely hard to get.
If you're planning to see it, you could book online.
http://www.sumo.or.jp/En/
The tickets for January Tokyo tournament will be sold from December 8th. Basically they are sold out.
(We are not a travel agency dealing with Sumo tickets.)