Apple calendar events and reminders completely disappeared from Ipad pro just recently Oct 2024

Has any one else had all their Apple calendar Events totally removed after the latest ipad Oct 2024 update?

I have an Apple Ipad pro 5th generation and after the last update in the last week i have lost EVERY event and reminder dating back to 2010 that have been carried over from older ipads that i have previously owned .

some of these events are very important , if any one has some hints on possibly recovery it would be appreciated. I have a backup that is 6 months old but i would like to recover important calendar notes to events that i have saved in the last 6 months. I do not use icloud.

MANY thanks in advance.

Allen