Instructions:

To add a subscribed calendar in iOS’s built-in calendar:

1) Copy the URL above
2) Go to (iOS) Settings
3) Mail
4) Accounts
5) Add Account
6) Other
7) Add Subscribed Calendar
8) Paste the URL in the field
9) Press Save

To add a subscribed calendar in Google Calendar (also for Android devices using Google Calendar):

1) Copy the URL above
2) Go to calendar.google.com
3) On the left side go to “other calendars” and click the dropdown
4) Choose Add by URL
5) Paste the URL
6) Click on Add Calendar and events should be imported

To add a subscribed calendar in Outlook.com:

1) Copy the URL above
2) Sign in to Outlook.com
3) At the bottom of the page, select the calendar icon
4) Select Add Calendar
5) Select Subscribe from Web
6) Paste the URL in the field
7) Select Import