Viewing Public Calendars In V3?

I've read that in the V3 calendar API, every request must be authorized. Is there a way to view public calendars in the new API that doesn't require any authentication?

Solution 1:

Yes, if the calendar is made public in the settings and is not owned by a domain that restricts the maximum access level, you can access it without authentication. For example there is a public calendar for movie releases with id 6qk18mdsijg7s1p800gbg7bmh4@group.calendar.google.com You can successfully retrieve it in the calendar API explorer without clicking on authorize: https://developers.google.com/apis-explorer/#p/calendar/v3/calendar.events.list?calendarId=6qk18mdsijg7s1p800gbg7bmh4%2540group.calendar.google.com&_h=2&