You should avoid using the steps in this article unless you have: You should perform the steps in this article from your computer with the most up-to-date calendar data.
Note: Remember to test to see if the issue you are experiencing still occurs after these steps.
Calendar (or i Cal) may contain duplicates and other unusable data that could prevent i Cloud Calendar from displaying and syncing properly.
Follow the steps below If you're experiencing an unresolvable issue with your i Cloud data in Calendar (or i Cal) that you have isolated to your calendar data.
If you delete your data, as recommended at points in this article, you will not be able to recover it, unless you have backed up your data.
The steps below will help you determine if any of your calendar data falls into these categories and will help you resolve any related issues.If you follow the steps and troubleshooting methods discussed in this article, you should be able to resolve most issues with i Cloud Calendar.If after following those methods, you still have issues in Calendar (or i Cal) that you know are related to your calendar data itself, the article below discusses additional steps you can take.Note: You may only have an ICLOUD section, but in some cases you could have both ICLOUD and ON MY MAC.
First, back up your calendars and reminders by following the steps in Archive or make copies of your i Cloud data.
It's very important that you back up your data prior to following the steps in this article as they involve deleting and modifying your data.