How to recover lost hotel and flight Bookings on iPad Calendar?

5 days ago my iPad Apple calendar was perfect. Then all of my hotel and flight bookings disappeared and I can’t get them back.

I never had to do anything, all bookings went to my calendar inbox and I added them.

I have restarted and I nothing is helping.

Suri is on, my email account is added.

I never changed any settings.

My iCloud is full, but it has been full for months.

I have reset my itinerary, but it’s not being found my the in box in the calendar.

Weird thing is one booking.com accomodation has come across and one British airways flight, with three other BA flights missing.

Please help

[Re-Titled by Moderator].

Original Title: Calendar lost all hotel/flight bookings