This worldwide celebration honors the day Baron Pierre de Coubertin convened the International Olympic Committee in 1884. There's a song that goes "I left my heart in San Francisco" -- a free pin will be mailed to the first person to post a comment correctly identifying where in the world de Coubertin's heart is buried in accordance with his wishes.
The 2009 Olympic Day events are marshaled by the City of Chicago and the Chicago 2016 Olympic Bid, so you can show your support and help bring the Games to Chicago just by checking out the bid website (be sure to check out the videos featuring Michael Jordan).
Anyone can find a nearby Olympic Day Celebration with this convenient U.S. map created for the occasion. I personally plan to take lunch at Centennial Olympic Park in Atlanta with a visit to the de Coubertin monument titled "Gateway of Dreams." (photo via Olympics.org)