This Saturday is Mini-Comics Day -- not to be confused with 24-Hour Comic Day, which is in October, although the two are kinda similar. The idea is to write, draw and print your own handmade comic book in a day or less.
Here's a description from the site:
On Mini-Comics Day, participating cartoonists from around the world will write, draw, and print copies of a mini-comic, completing the entire process from start to finish in a day or less. Anyone in the world can participate.
Mini-comics have been democratizing the art of making comic books since the 70′s or earlier… with the popularization of photocopiers, it became apparent that anyone with an inclination and some spare change could print a little comic book. Wildly varying in both form and content, mini-comics are a wonderful synthesis of cartooning and hand-made art objects.
Several places, including comics retailers, around the world are hosting Mini-Comics Day events; you can find a complete list here. And if you're curious about how to make your own mini-comic, The International Cartoonist Conspiracy has a handy guide in PDF format.