Training at the Kodokan is available everyday but the people there can vary from day to day as so many people like to drop in.
On Tuesday I was lucky enough to do Ne-waza and Tachi-waza with Caludio Calasans. He is both a Judo and BJJ black belt and smashed me both on the ground and standing up. He is over in Japan to do a series of seminars and is a very nice and humble guy.
He didn't even seem to mind that much when I didn't know who he was. Needless to say I was embarrassed to find out he is both the current IBJJF U82kg Champion and the Winner of the 2015 ADCC Absolute category!!!!
I guess I really need to start paying more attention to my sport :-(