Several years ago we staged a "protest" at our nude beach. I still
have those signs we posted all around the beach and trail head.
There was a news story in a city paper but the amount of
participants was light. Still ... it was a worth while cause but
they took our beach away anyway.
Pretty much throughout the 70's. It was called The Free Beach Movement, spearheaded by Lee Baxandall, who founded The Naturist Society. As far as organizations go, TNS and NAC (Naturist Action Committee, part of TNS) are the only ones who actively work to protect and expand our nude beach rights. You might also contact the South Florida Free Beach organization for information. They created Haulover nude beach near Miami.
Any protest would have to be very well organized and have the means to get any arrest charges dropped. There is merit to having a large number of participants, so every means of attracting them and knowing how many to expect would be helpful as well. If the group is too small, it just will not be effective. All this being said, protests do bring results and continue to be an accepted American institution. The Supreme Court has ruled that protesting while nude is protected free speech. That does not mean that attempts won't be made to stop it.
It should be tied to a marketing campaign to be effective. It should be done in a tasteful way so that you don't get painted in the media as whackos. Use local blogs, and sensible people as well as getting help from the national organizations.
The World Naked Bike ride that attracts 8-10,000 participants each June in Portland, Oregon, has a protest/demonstration as it's legal premise. As long as the riders are demonstrating for bike safety, body acceptance, or the like, they can legally ride nude in the city. There is also a tradition of nude bike rides on each full moon of the summer and the same legal principle applies. On the last ride of the summer on Sept 5, 2017, several of us rode around the city for 4 hours naked, encountering a half dozen police cars, none of which even slowed down to confront us. Indeed, I've seen ads on Seattle TV stations for Portland tourism showing a drawing of a nude cyclist, among other attractions the city has to offer.
Attached photo is of me down by the Willamette River with the downtown area across the water. Not sure why it uploaded the same pic twice.