calendar – apple calendar

On the Mac – open Calendar, then click File (menu) / New Calendar Subscription

Do not just click on the link – the calendar will not update with future dates as they are added if you do.

Instead go to Calendar / File / New Calendar Subscription

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Then paste this in the calendar URL box and click subscribe:

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iPhone
If this calendar account is already on your phone, the nursery calendar should now appear on it it after a short delay. If not, click on iPhone instructions 

Android – you will need to add this calendar to a Gmail account on a computer first, before it will appear on an Android phone.