Like Christmas and New Year's, July 4th moves around every year as a stand-alone holiday that isn't surrounded by other days off. So about every six years when it falls on a Saturday, distributors fret about its negative impact on what is usually the biggest day of the week. And the normal pattern (last seen in 2009) held, with Saturday the 4th down 33% from Friday (which many people took as a holiday, so it picked up some).