Back in 2013 a small local museum (ESMoA) invited our non-landed club (SCNA) to have a nude event in their museum to compliment their exhibit of nude artwork. We repeated that event in 2015. In addition we've participated at the NudeLA art event mentioned earlier by Mizoka and Doneright (who we got to meet). Every year except the Covid years we've hosted a Scavenger Hunt at the Getty Museum. Unfortunately we can't be nude there, but the hunt is based around answering questions about all the nude artwork in the various pavilions.
Like Mizoka, Doneright, and jaybirds, I've been to the one in Los Angeles, multiple times. And, so folks can find it, the event is actually called Nude Art LA. The website is still active with a 2023 copyright date. nudeartla.com. So, hopefully they will resume events. They began annually, but actually had a couple a year, once they got going. And the organization isn't one particular museum or studio. The events are held in various spaces. Some intimate, with different rooms, some in more of an open plan. Along with the art, they have had artists drawing/painting live models, a space for guests to draw, a catwalk for fashion shows, and so on.
Just saw this report today from a recent event and thought some might be interested. You can switch over to an English version on the site.