Any chance of last minute TeamAyu concert? Tokyo trip

[*Petit*]

Hey everyone !

I'm going to Tokyo Japan in a few weeks (first 7 days of October). It was kind of on a whim and I didn't expect there to be any ayu concerts or related activities there when I booked the trip. As it turns out the TeamAyu tour will be in Tokyo while I'm there. Is it too late to sign up for teamayu and get a ticket? And if it is, would there be any way to go without being a team ayu member?
Also if anyone has any tips for things to do in Tokyo / osaka / kyoto area, it'll be my first time there.

Thank you so much in advance.