Attending the Osaka Expo Sept and Oct

While we have some flexibility with dates, we were hoping to be there at the end of Sept. We'll have to buy the season pass as we plan to attend for multiple days due to limited stamina (Mom's 97 years old this year :) ). However, the website doesn't seem to allow one to pick a reservation after 28 Sept.

There was something about they expect pass holders to show up in those last weeks???

I was also wondering if there was to be any accommodation for disabled foreign visitors.

Thanks in advance

Reservations can be made 6 months in advance. So, today it is possible to buy tickets for dates through September 22.