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Anything that has a day or time context to it should be placed on your calendar.
A chart or series of pages showing the days, weeks, and months of a particular year, or giving particular seasonal information.
An action that needs to happen on a specific day, but not necessarily at a specific time. For exampe, "call Dad for his birthday".
Something you need to know on a given day, such as the directions to the seminar you're attending.
Something you create (and trust) to alert you when you are required to do (or remember) something.
Any input that has arrived in your world for which you have not defined the meaning.
An action that must happen at a given time on a given date. Typical examples include meetings and appointments.
For knowledge workers, there is a lot of work to do defining our work before we can start actually doing our work. The 5 phases of workflow is the GTD model for capturing, defining and doing our work.
This is where we decide exactly what each new input means to us.