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 .

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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iCloud User Guide

Ways to share a calendar on iCloud.com