1. Invite Team
By clicking your name in the navigation and following the My Account -> Invite Team path you can now bring in additional editors/users into the account.
2. Manage Access
On a site-by-site basis you can now "Manage team access". This gives you the power to grant different users access to specific calendars.
By default invited team members won't have access to a calendar, only once they've been granted access by an admin.
An introduction email will be sent to the editor granting them access to the calendar.