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There are twice/three time yearly events run by the guys at Tempra Cycle (good friends of mine I ride with pretty regularly and good guys as elluded to by @Elra ).
Language is less of a barrier than you'd imagine but you do need to know the right people to get information etc.
It is in Kawasaki so really easy to get to from Tokyo (30 minutes or so)
There is a Facebook page (just search 'BANK' in capitals) for those events and I tend to go each time (I have been twice and ridden - once to spectate).
PM me any more questions about Tokyo if you need some help (I live here permanently and speak Japanese (not that well but I get by)).
Thanks
Yeah. Also probably a nightmare not knowing the language especially if it isn't a popular activity.