Sometimes you simply need to make note of an appointment, without needing the bells and whistles such as appointment length, whether the appointment is recurring, how much of the task has been completed, and so on. This might be a lunch with a friend or even a phone call whose duration you don't know and don't care to notate.
Click the desired time in one of the Calendar views that shows time, such as the Day and Work Week views.
Start typing your event text.
When you're finished, press the Enter key. The entry will be saved for that date/time.
If you need to edit the item after entering it, simply click the text and then make your changes. Alternatively, you ...