If you would like to add the ACTApple events calendar to your own calendar (if it supports the iCal format), then use the url (one line)
https://www.google.com/calendar/ical/8s4eevl2eok3eg2sn5l143rmds%40group.
calendar.google.com/public/basic.ics
So for example, in Apple iCal you use the menu item “Calendar” – “Subscribe” and paste the URL above.