1. In Calendar, choose File > New Calendar Subscription.
2. Enter the calendar’s web address, and then click Subscribe.
3. Enter a name for the calendar in the Name field and choose a color from the adjacent pop-up menu.
If you have an iCloud account, choose whether you want the calendar on that account.
To view a subscription calendar in Calendar on your Mac and on devices with iOS 5 or later without resubscribing to it, choose your iCloud account.
To get the calendar’s event attachments or alerts, deselect the appropriate Remove check boxes.
To update your copy of the calendar when changes to it are published, choose the update frequency from the “Auto-refresh” pop-up menu.
4. Click OK.
To make changes to the calendar, click the name of the calendar, and then choose Edit > Get Info.
To subscribe to a calendar from a link on the Internet or an email you received, click the link.