Unlike Black+Rock+City in Nevada, Slab_City,_California remains residential throughout the year.
https://en.wikipedia.org/wiki/Slab_City,_California#Arts_and_culture
The Last Free Place in America? https://www.youtube.com/watch?v=IFRBdZ9jdyQ
Self-Governing Off the Grid Squatters Paradise - Slab City's Story https://www.youtube.com/watch?v=ILcUScfebJ4
https://www.worldatlas.com/articles/10-thriving-cities-built-in-deserts-across-the-world.html
https://desertshapes.blogspot.com/search?q=Cities+in+the+Desert