To add the calendar to your Google Calendar, click this link.
To add the calendar to a different calendar, use the link and instructions below.
Use this link to add the calendar:
https://calendar.google.com/calendar/ical/e1ea9c46509928520cf0ac36372f4cfc39b2f3a66983463c1cea1d65930d33c1%40group.calendar.google.com/public/basic.ics