If it is private, click the ICAL button next to the calendar's Private Address.
Log into your Google account and click Calendar on the Google bar.Outlook will periodically check the Google Calendar for updates, and if any new or modified events are found, they will be downloaded and displayed alongside with your Outlook appointments. Using this method you can set up one way syncing from Google Calendar to Outlook.
How to synch Google Calendar with Outlook (read-only)