To subscribe to this calendar:

1) login to Gmail or Google

2) go to:
https://calendar.google.com/calendar/render?cid=qf8vj00k7jm0o7kmpu4e6b06dk@group.calendar.google.com

You can also add the calendar by choosing Import, and giving this calendar ID: 

qf8vj00k7jm0o7kmpu4e6b06dk@group.calendar.google.com

More calendar instructions:  Import Calendars