UPDATE: Check out the Flickr slideshow for Grand Rapids Sidewalk Chalk and also the Grand Rapids Sidewalk Chalk Flood group for a ton of photos from the event!

In Rob Bliss calls artists of all ages to downtown Grand Rapids, Rapid Growth reports that social networking maven Bliss (who Facebooked up a giant pillow fight and a the world record zombie walk in Grand Rapids last year) is at it again:

Bliss plans to hand out 10,000 30,000 pieces of sidewalk chalk at Rosa Parks Circle on Saturday, April 18, to see what collective creative energy will bring to the core city. He hopes the Sidewalk Chalk Flood will bring the most age diverse crowd to downtown Grand Rapids of all his prior social experiments, such as the pillow fight that received national television coverage on CBS News last fall.

"The chalk flood is really meant to appeal to the child in us all," says Bliss, a sophomore at Grand Rapids Community College studying vocal and piano performance. "We hope everyone from experienced artists to families with kids will let their creative side come through that Saturday."

Chalk will be distributed free of charge from noon to 5 p.m., primarily funded by the Downtown Alliance, with support from the Urban Institute for Contemporary Arts and Grand Rapids Community College. Artwork on public pavement only; anything on buildings is strictly verboten.

Click through for the Grand Rapids Sidewalk Chalk Facebook group and if you get photos, definitely add them to the Absolute Michigan pool on Flickr!