One recent project, set to tour the U.S in the coming weeks, is The Sketchbook Project.
This past year they sent 28839 artists from 94 countries blank sketchbooks. Just under 10,000 books were returned completed — all of which will be on display.
The tour started February, 2011. It's coming to Seattle, June 10-12 at:
Seattle, WA 98121
Plenty of time to sign up for the next one! Go to http://www.arthousecoop.com/projects/sketchbookproject for all the info.