I've just been reminded of this thanks to Dinosaur Tracking. It's a day when anyone and everyone is encouraged to simply draw a dinosaur. It doesn't have to be good, just a dinosaur. I'm going to do it myself and I'll post the image here.
Here's the info:
Draw a Dinosaur Day.
A bit of additional info at Art Evolved. They host a draw a prehistoric beast drawing event every few months. Therizinosaurs are next. I've done one just need to scan it, so you might get 2 new drawings tomorrow:)