Calendar Sharing in Google is very similar to Calendar Proxy Rights in GW. Users can share a calendar with another user, the entire RISD Domain or outside of the RISD Domain. Users can share full access and managing capability or limited access; allowing users to see only free/busy. See the screen shot below to see an example of the Sharing Settings.
The domain default for sharing outside of risd.edu is to see free/busy only. Users are not able to share more information or allow managing of events outside of risd.edu.
The domain default for sharing within risd.edu is also to see free/busy. Users will have the ability to override this setting and allow others to see more information and manage events.
Visit this link for Google's instructions on sharing your calendar: