Marvin M. Doyley writes:org-caldav[1] works with Google Calendar on the old, deprecated CalDAV
> Is there a way to sync org-agenda with google calendar so that I can
> exploit googles calendar reminder.
endpoint (https://www.google.com/calendar/dav). I hear that the endpoint
is still working for some people, so maybe you are in luck.
Moving to the new endpoint would require OAuth authentication, which
shouldn't be hard to add using the oauth-library in ELPA, but since I
don't use Google, I'm lacking motivation...
-David
https://github.com/dengste/org-caldav