How do Calendar events and tasks differ?
Events are occurrences with definite beginning and end times, such as meetings or parties. Events display in your personal and group calendars in the Calendars section of your Calendar account. For more information, see Scheduling Events in Calendar.
Tasks are to-do lists of objectives, such as reports or assignments. You can assign due dates to tasks, but they do not require definite beginning and end times. Tasks display in the Task section of your Calendar account. For more information, see Creating Calendar Tasks.