Howdy Rplong2,
Thanks for using the Apple Support Communities.
For help with sharing a calendar on your Mac, please make sure that you're following through the proper steps which are outlined below:
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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.
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Click Share With or Shared With, then enter the names or email addresses of people you want to have access to your calendar.
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Click the pop-up menu
next to each name, then choose whether the person can edit your calendar or only view it.
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To let anyone view your calendar—including people not listed in the Shared With field—select Public Calendar.
To send people a link to subscribe to your public calendar, click the Share button
, then choose how you want to send the link.
People who subscribe to your public calendar can view it, but can’t change it. Only people listed in the Share With field who have view and edit privileges can make changes to the calendar.
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Click Done.
People you added to the Shared With field are sent an invitation (a notification and an email) to join the shared calendar.
Calendar (El Capitan): Share iCloud calendars
Take care.