If you are a google calendar user, you can add this calendar using your desktop browser using the "Add to google calendar" icon on the bottom right

Once you've added the calendar using your desktop browser, if will appear in your mobile device next to you sync your google calendar.  You may need to enable it by enabling to your calendar settings

If you are not a google calendar user, you can still add the calendar to your desktop or mobile device using this link

https://calendar.google.com/calendar/ical/kp8kv0jgrvdbqqjq3qpa19dr5c%40group.calendar.google.com/public/basic.ics