A _very_ strict code of conduct for attendees is something that can (and does) work.
Jazz pianist, Keith Jarrett has been known to stop his 4-hour long improvisation sessions in some of the world's most prestigous venues mid-flow to dress down an attendee trying to film him. People don't make that mistake twice. https://www.theguardian.com/music/musicblog/2007/aug/09/keit...
Unrelated, but I'd be way more on board with this if the DVD of the show wasn't £30 afterwards.