...
Lastly, you can consolidate other Calendars into this view by adding them to the Other Calendars Grid. These Calendars must be accessible by the CalDAV protocol, and you need the login credentials for each added Calendar.
Share Your Events
To designate other Users for sharing your events, click the "Share My Events" button at the top of the Calendar/Grid view. You can either share your events by default by clicking the checkbox labeled Share My Calendar Events by Default, or you can choose individual Users to share events within the Grid.
...