A Private Events Calendar 
A private calendar allows your users to post events for themselves that no other users can view.
1Click Calendars & Moderators->Calendar Permissions.
2Find the calendar you wishto modify. You need to complete the next step for each usergroup by pressing [Edit].
3If you want this group to be able to post private events, make sure Can Post Events is set to <Yes>.
4If it is not, select Use Custom Permissions, then select <Yes> next to Can Post Events.
5Make sure Can View Others' Events is set to <No>.
6If it is not, select Use Custom Permissions, then select <No> next to Can View Others' Events.
7Click [Save]
Warning:
If you fail to select <No> for Can View Others' Events for every usergroup of your Calendar, then the missed groups will be able to see other user's private events
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