iCloud
iCloud User Guide
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Ways to share a calendar on iCloud.com
You can share calendars publicly and privately. In the sidebar, a shared calendar has a darkened Share button 
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Only the calendar’s owner can make changes to a public calendar.
For private calendars, you can assign two types of access privileges to the people you invite:
View & Edit: The invitee can create, edit, and delete events, and track invitation responses.
Only one person can edit a shared calendar at a time.
View Only: The invitee can only change their own view settings.
Note: Only a calendar’s owner can share it.
If you stop using iCloud, any shared calendars you created become unavailable; all participants automatically receive an email notifying them that the calendar is no longer shared.
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