Unfortunately your website is no longer working.
Here's the download link in the Scripts Database:
http://www.msgpluslive.net/scripts/view/506-Google-Plus/
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I can't get it to show my events, unfortunately.
I logged in and it authenticated, but I check the events and nothing happens.
I tried changing the 'Google Calendar location' to my calendars' private feed URL, but same happens.
Note: PM sent to OP