If you want to add this calendar to your own (online) calendar, you can do so by following the following instructions:
- Google Calendar: Just click on the +Google Calendar on the embedded calendar and click confirm. This will add this calendar to your own account and keeps it synchronised, meaning any new events or changes will pop up on your calendar instantly.
- Everything else: import the following ICAL link to your calendar application (https://calendar.google.com/calendar/ical/17gim9nkndjpvpnhp1pr64l410%40group.calendar.google.com/public/basic.ics). Unfortunately this will not keep the calendar synchronised, so no new events or changes will show up on your calendar.