1976 was a busy year in Philadelphia. They were holding the Bicentennial celebration, commemorating the two-hundredth anniversary of the Declaration of Independence. As part of the year-long festivities, the city had become a hub for events, hosting the championship game of the NCAA Final Four, as well as the all-star games for baseball, basketball and hockey. On the 4th of July, around 2 million people descended on the city for the celebrations, which featured a five hour parade with over 40,000 marchers and floats from every state. But it was to be a small, 2000 person event that would go down in history.

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Image courtesy Flickr user DaveZ