Share individual CalDAV calendars on Mac
You can share individual calendars hosted in CalDAV with other people who have accounts on the same calendar server. You can choose whether others can edit a shared calendar or only view it.
If you want to allow someone else to view and edit all of your CalDAV and Exchange calendars, you could share your account.
Share a calendar
In the Calendar app
on your Mac, place the pointer over the calendar’s name in the calendar list, then click the Share Calendar button 
.If you don’t see the calendar list on the left, choose View > Show Calendar List.
Click Share With, then enter the names or email addresses of people or groups you want to invite to share your calendar.
If you don’t see Share With, click below the last name or email address in the Shared With list. If you see a Shared By [name] list instead of a Shared With list, only the person named can add people.
To keep someone from making changes to your shared calendar, Control-click the person’s name or email address in the Shared With list, then choose View Only.
Click Done.
People you added to the Shared With list are sent an invitation (a notification and an email) to join the shared calendar.
Resend a shared calendar invitation
In the Calendar app
on your Mac, place the pointer over the calendar’s name in the calendar list, then click the Share Calendar button .If you don’t see the calendar list on the left, choose View > Show Calendar List.
Control-click a person’s name, then choose Invite Again.
Stop sharing a calendar
In the Calendar app on your Mac, do any of the following:
Stop sharing your calendar with specific people: Place the pointer over the calendar’s name in the calendar list, then click the Share Calendar button
. Click a person’s name, then press Delete.Stop sharing your calendar with everyone: Control-click the calendar in the calendar list, then choose Stop Sharing.
Stop subscribing to someone else’s calendar: Control-click the calendar in the calendar list, then choose Unsubscribe.
When unsubscribing from a calendar, you can also report it as junk. Reporting junk helps Calendar better identify junk subscriptions.
If you don’t see the calendar list on the left, choose View > Show Calendar List.