From physicscentral:

"Physics fans, rejoice! April 24th is National Physics Day, and physics enthusiasts across the country are celebrating with fun physics demonstrations, public lectures, and other science events.

But National Physics Day isn't new; revelers have celebrated physics on or around April 24th for the past 18 years, starting in 1995 at the University of Virginia.

...

Imploding drums, demos on beds of nails, and exploding balloons have been a hit at the University of Virginia's celebrations in past years, said Steve Thornton, a University of Virginia physicist who organized the first National Physics Day."

> For more, see: http://physicsbuzz.physicscentral.com/2012/04/its-national-physics-day.html

> Link to our poster: http://www.phys.virginia.edu/Announcements/PhysicsDay/npd2012.pdf