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The involved steps would be:
* Create additional Google account
* Log in /switch to the new account
* Create the shared calendar and share it with the those that should have access to change it
* Setup notifications on the calendar
* Forward all email to a mailing list or to select users and archive them or trash them
** Accept the requests to receive forwarded mail on each account to forward to
* Logout and enjoy the shared calendar with notifications on every event, including those done by yourself.