Ready to feel a rush of excitement — and a rush of cold water on your bare skin? This Saturday, July 11, is the latest International Skinny Dip Day. Yes, celebrants strip down for International Skinny Dip Day every second Saturday of July. According to Days of the Year, free beach advocates Lee Baxandall and Eugene Callen scheduled a yearly National Nude Weekend for the month of July in 1976. Then Baxandall’s Naturist Society expanded that annu…