Add or delete calendar accounts on Mac
If you keep calendars in Internet accounts—for example, iCloud, Yahoo, or another CalDAV account—you can use the accounts in Calendar on your Mac, and access all your calendars and events in one place.
Add a calendar account
In the Calendar app on your Mac, choose Calendar > Add Account, select the account type, then click Continue.
Follow the onscreen instructions.
Each account you add is listed separately in the sidebar. If the sidebar isn’t showing, choose View > Show Calendar List or click Calendars in the toolbar.
Set up your iOS devices to use the same account, so that your calendars stay up to date across all those devices and your Apple Watch.
Stop using a calendar account
You can temporarily stop using an account so that its calendars and events no longer appear in Calendar on your Mac.
In the Calendar app on your Mac, choose Calendar > Accounts, then select the account you want to stop using.
Deselect the Calendar checkbox.
To use the account again in Calendar, select the Calendar checkbox. The account’s calendars and events reappear.
Delete a calendar account
If you no longer want to use an account in any app, including Calendar, you can delete the account.
Note: If you use iCloud Keychain, and you remove an account (other than your primary iCloud account), you’re asked whether to remove the account from your other Mac computers that use iCloud Keychain, or just turn off all the account features on this Mac.
In the Calendar app on your Mac, choose Calendar > Accounts, then select the account you want to delete.
Click the Remove button at the bottom of the account list.
You can view, add, and modify events, and respond to invitations, in the Calendar app on all your devices that use the same accounts. You can also view, add, and modify your iCloud calendar events, and respond to invitations, on iCloud.com. Changes you make show up everywhere, so you always have your most current calendar events at hand. Calendar notifications also appear on your Mac and other devices that use the same accounts.
If you use Handoff, you can switch between your Mac and other devices while creating, modifying, or viewing events and calendars. To open an event or calendar handed off to your Mac, click the Handoff Calendar icon that appears at the left side of the Dock.