Users may notice that Events that are accessible in Salesforce Classic are not visible when they access the Calendar in Lightning Experience. Accessing the Calendar in Lightning Experience may also return an error message:
This behavior occurs when the profile assigned to the user does not have the minimum requirements to display Calendars and Events in Lightning Experience.
1. Navigate to the profile of the affected user
2. Set Field Permissions in Permission Sets and Profiles to at least 'Read' access for all of the following Event object's fields:
3. If you have this error in a community please check the Sharing Setting for the calendar object:
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