Dan
"(2 nights in Tokyo during Sumo tournament)
DO anyone?"
Totally worth it. Went to see Sumo tournament last year, REALLY cool. Aim for the end of the tournament schedule as the matches are better. Also, even though they last all day you really only need to go for the end. We showed up early/on time and it was just us and the sumo wrestlers families watching. Seems like the good matches people want to watch happen at the end, which we stayed for but it was a looooong day. Happy to discuss if you want.