http://www.linux.com/learn/docs/713646-how-to-monitor-benchmark-use-a-calendar-and-play-games-in-the-linux-terminal-
http://calcurse.org/
Neat tool. I have it so it fires up with a middle click when I hover over,
which is my xterm icon on me Window Maker .
Only had it for a day or so, I'm still getting to grips with it. Seems quick and easy to use and might do everything I need.
It may be possible to incorporate in conky. Conky configuration is my winter project for this year as I'm too busy at the moment.
I chose that particular icon as it is always a mystery as to what will happen when I press enter in a terminal