iCloud: Calendar sharing overview
Sharing works as follows:
Public calendars can be shared with anyone. To access public calendars, visitors need to use Calendar on a Mac, Microsoft Outlook on a Windows computer, or any other app that supports the iCalendar file format.
A public calendar can’t be edited by anyone but the calendar owner (the creator).
Private calendars can be shared with other iCloud users.
Participants can view the calendar using iCloud Calendar; the Calendar app on iPhone, iPad, iPod touch, or a Mac; or Microsoft Outlook on a Windows computer.
As the owner (creator) of a shared calendar, you assign edit privileges to the invitees to control who can modify the calendar. There are two types of access privileges that can be assigned:
Participants with View Only access can:
View the calendar and change their view (from day to week, for example), without affecting the view of other participants
Change their own calendar preferences
Participants with View & Edit access privileges can do everything listed above, plus:
Create and delete calendar events
Change details (for example, the name, date, and time) for calendar events
Track the responses of guests invited to a calendar event
Participants can’t invite new people to a shared calendar.
If you disable your iCloud account, any shared calendars you created become unavailable; all participants automatically receive an email notifying them that the calendar is no longer shared.