EMG Sketch Fest
This is a roughly monthly art jam running from one Friday to the following Sunday, noon to noon Alaskan time. There is a focus on fantasy themes.
What's the deal? You can leave prompts for other people to use, and/or draw sketches based on other people's prompts. You may not spend more than 1 hour per sketch. (Finishing it later is cool, though.)
Where, how to take part: Sign up on the official website, www.ellenmilliongraphics.com/sketchfest/