Found this @ PhotoTechniques magazine

Worldwide Pinhole Photography Day, April 24, 2005,
a global event celebrating the fantasy, art, fun and
experience of lensless photography. All photographers
around the world are invited to take a picture with a pinhole camera during the 24 hours of Sunday, April 24
and upload it to www.pinholeday.org. A photo by each
artist ill become part of the international web gallery on the site.

Go to the website for more information and the
full program for the event.