Apple Calendar

1. Copy the link.
   Learn where you can get it here.
   
   
2. Open Calendar.
   
   
3. Click on File ➞ New Calendar Subscription... and enter the link.
   
   
4. Click on Subscribe.
   
   
   
   
5. Set auto-refresh.
   
   

iOS Calendar

1. Copy the link.
   
   
2. Go to Calendar and tap Add.
   
   
3. Select Add Subscription Calendar.
   
   
4. Paste the link and tap Subscribe.
   
   
5. Enter your calendar title and tap Add.