Events are not appearing in calendar
For all other users, if you’ve previously subscribed to a calendar and are not seeing events in your calendar, the best option is to resubscribe. Here’s how:
Head to your Library.
Find the calendar or group that you need to resubscribe to, and click on Resubscribe in the drop down:

On desktop, click on the first icon to resubscribe:

This should open up your calendar app and prompt you to add the calendar again. If your calendar does not open, you will need to manually import the calendar subscription.
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