The following options exist:
To create an appointment in a calendar, you need to have the permission to create objects in the calendar.
You can not create appointments in subscribed calendars.
Tip: Whether it is best to use an appointment or a task can be determined based on the following criteria:
An appointment takes place at a defined point in time. If you need to execute an action at a defined point in time, create an appointment for this action.
A task has a due date and sometimes a priority. If you are flexible regarding the time schedule of an action and only have to respect the due date, enter a task for this action.
Parent topic: Calendar