My calendar was deleted
How can I restore my calendar? It is gone
iPhone X, iOS 13
Determine where your calendar was housed. Check to see you are still looking there for your calendar. Check the housing framework to see if the data is still there.
For example, perhaps you house your calendar in gmail. If so, check Settings > Passwords & Accounts > Gmail > Calendar to be certain it’s ”on”. Check at gmail.com to see if your calendar entries are still there.