Outlook.com automatically creates a holiday calendar for your country or region, if it's available. You can also add Outlook.com holiday calendars from other countries or regions, as well as lunar calendars.
Notes
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The events in holiday and lunar calendars are read-only. You can't edit, delete, or share them.
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For more info about adding other types of calendars, see Import or subscribe to a calendar.
To add a holiday or other calendar
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From the following list, click the calendar you want to add. You’ll be taken to your Outlook.com calendar.
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Click Subscribe. The URL and calendar name should be filled out.
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Select a color and charm for the calendar, and then click the Subscribe button.