The "Free the Free Strand" Committee is Formed in 1975

Hadley argued that the naked use was bringing too large a crowd for the website. Baxandall and some other free beach enthusiasts developed a support group--the Free the Free Beach Committee--to protest the prohibition. With his ties in publishing in Oshkosh, he was also the clear choice to direct any activist writing jobs that came up. On August 23, 1975 the Free the Free Beach Committee formed a nude beach "celebration" (the National Park Service wouldn't let a "protest") that brought thousands of law-abiding free plage supporters. Law enforcement mentioned no one for nudity, and the event was deemed a success. It drew attention to the powerful public support for preserving Truro's unofficial clothes-optional status. Both men determined to meet to discuss uniting the efforts of East and West coast nude beach activists.
In May 1976, Baxandall met with Beachfront USA in Los Angeles to discuss ways of combining their efforts and to further improve the free beach movement. They agreed to designate August 7, 1976 as National Nude Beach Day. The West Coast group developed its own groundwork to bring media interest on that day. But an alternate "rain day" had been pre-declared, and the Cape Cod occasion happened on a cloudy but warm August 14. The accomplishment of these Cape Cod "parties" was supported by the fact that for nearly a decade afterwards the Department of the Interior and its National Park Service said nothing more about banning nudity on federal land.
https://videonudist.com/categories/amateur/4/ & Nude Recreation Week