This congressionally recognized holiday honors Harvey Ball, the creator of the yellow smiley face symbol. After his death in 2001, a foundation was created to honor and promote this holiday. Here is an excerpt from their site (http://worldsmileday.com/):
"As is well known by now throughout the world Harvey Ball, a commercial artist from Worcester, Massachusetts created the smiley face in 1963. That image went on to become the most recognizable symbol of good will and good cheer on the planet.
As the years passed Harvey Ball became concerned about the over-commercialization of his symbol, and how its original meaning and intent had become lost in the constant repetition of the marketplace. Out of that concern came his idea for World Smile Day®. He thought that we, all of us, should devote one day each year to smiles and kind acts throughout the world. The smiley face knows no politics, no geography and no religion. Harvey’s idea was that for at least one day each year, neither should we. He declared that the first Friday in October each year would henceforth be World Smile Day®. Ever since that first World Smile Day® held in 1999, it has continued every year in Smiley's hometown of Worcester, MA and around the world.
After Harvey died in 2001, the Harvey Ball World Smile Foundation was created to honor his name and memory. The Foundation continues as the official sponsor of World Smile Day® each year."