Creating Delegates for your Calendar

* If you're using Outlook for Mac, here's the procedure:  Add and manage delegates in Outlook for Mac - Office Support (microsoft.com)

* If you're using Outlook for Windows, here's the procedure:   Allow someone else to manage your mail and calendar - Office Support (microsoft.com) 

* To accomplish this using Outlook via browser, here's some documentation:  Delegation setup: Office 365 or Outlook Web App (OWA) | OnceHub