Add to Apple Calendar

1. Copy the calendar URL
2. Navigate to Google Calendar → Settings → Add Calendar → From URL
3. Paste the calendar URL into the form field
4. Click "Add calendar"

Add to Outlook

1. Copy the calendar URL
2. Navigate to Outlook.com → Calendar
3. Click the "Add Calendar" button
4. Select "Subscribe from web" from the left-hand menu
5. Paste the calendar URL into the field
6. Enter a name for the calendar and choose a color, if desired
7. Click "Import"