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Show or hide the Birthdays calendar on Mac
The Birthdays calendar displays birthdays it finds in the Contacts app.
- In the Calendar app  on your Mac, choose Calendar > Preferences, then click General. on your Mac, choose Calendar > Preferences, then click General.
- Select or deselect “Show Birthdays calendar.” 
You can’t add or remove birthdays directly in the Birthdays calendar; instead, you update them in the Contacts app. When you add or remove birthdays in Contacts, the Birthdays calendar is updated automatically.
If you add calendars from your Google account, a separate Birthdays calendar shows the birthdays for those friends and contacts.