Re: Advice on Hombu dojo etiquette
chiba sensei has a very strong relationship with hombu dojo. but i don't know if that means there's any exemption in training fee/registration fee. just make sure you've got alot of yen when you get to the dojo.
you can bring your birankai passport with you, i'll be corrected and tarred and feathered if i'm wrong, i believe aikikai registration number is received at the dan level.
i hope you enjoy your classes at hombu. great teachers. fun time. try to make at least one class with miyamoto sensei, since he's a regular fixture at birankai summercamp.
also, check with your sensei. chances are, he's already visited hombu, or knows others who have. they'll steer you in the right direction.