How do I subscribe to an external calendar?
If you have the URL of a calendar in an external calendar program, you can subscribe to the calendar in the Calendar tool so that its events will appear in the tool in your site.
Select the Calendar tool in your site.
Select the Calendar tool in the tools menu in your site.
Select Merge External Calendars.
Select Merge External Calendars in the menu bar near the top of the page.
Enter the calendar name and URL, and select Subscribe.
Enter a name for the calendar into the Calendar Name field, and the calendar's URL into the URL field. Select Subscribe to subscribe to the calendar.
The calendar will be added to the subscription list. Select Save to save your changes.