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Show or hide the Birthdays calendar on Mac
The Birthdays calendar displays birthdays it finds in the Contacts app.
- Go to the Calendar app  on your Mac. on your Mac.
- Choose Calendar > Settings, 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.