What’s On Your Calendar?

Calendars are such a common productivity tool that everyone thinks they know how to use them; yet just about every time I ask to see someone's calendar, I find stuff on it that shouldn't be there. So I ask you, what's on your calendar? Today we will look at what should go on a calendar, and where all that other stuff should live.

[source: http://www.simpleproductivityblog.com/whats-calendar/]