To subscribe to the calendar:
Google Users
Click the “+ Google Calendar” icon in the bottom right corner of the calendar
Outlook/Apple Users
Use the subscription URLs below
All School: https://calendar.google.com/
On Outlook, click the [ + Add ] button, choose “From Internet…” and paste the URL into the location edit box.
On iOS/Apple, in Settings, go to Calendar > Accounts > Add Account > Other > Add Subscribed Calendar and paste the URL into the Server field.