To add the Syncing Calendar to calendar apps (e.g., iPhone’s Calendar app):
webcal://calendar.google.com/calendar/ical/lemondeimmersion.org_7ehneoeuk7fr9lo067ut2ivfo8%40group.calendar.google.com/public/basic.ics

To add the Syncing Calendar to the calendar in your Google account:
https://calendar.google.com/calendar/r?cid=lemondeimmersion.org_7ehneoeuk7fr9lo067ut2ivfo8@group.calendar.google.com