Hi, Broulee
You can visit a sumo stable, but before visiting there, you have to remember so many rules for visitors.
Here is a brief guide of Kasugano sumo stable for visitors (written in Japanese):
http://www5f.biglobe.ne.jp/~kasugano/address/index.htmlTo describe briefly what is written there in English:
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Don't visit the Kasugano stable just like sightseeing. Sumo stables are a personal house, not a sightseeing spot open for public.
While staying there, don't talk even in whispers. (All human voices except those of sumo mentors are nothing useful for sumo wrestlers)
No smoking, no eating, no chewing gum, please.
When taking photographs, take them while sitting. Don't stand up. Don't move to another seat while taking. Don't use photoflash.
Turn off your mobile phones.
Visit with "at least one" native japanese people. A group having no Japanese can't visit the Kasugano stable.
A group of less than 5 persons can visit without reservation.
Don't include a person having no interest in sumo.
Don't look back a sumo arena. It means irreverent attitude.
Don't stay only for a short time. Frequent motion of visitors is something making sumo wrestlers distracting, causing an accident while fighting.
Kasugano stable
Ryogoku 1-7-11, Sumida-ku, Tokyo
7 minutes walk from Ryogoku station (JR Sobu Line)
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Even for typical Japanese people,
visiting a sumo stable needs a lot of patience, carefulness and attention.