John Mayer and Dave Chappelle have teamed up to do a few shows together in San Francisco, and a STRICT no cell phone ban will be in place. The crowd will be forced to put their phones into locked pouches so they can't record the show.
(Dave joined John on stage a few weeks ago to pay tribute to Charlie Murphy, and asked fans to put their phones away to keep the moment private. Most people didn't follow those instructions, so this phone ban really isn't a surprise.)
The shows will be called Controlled Danger, and obviously will be a mix of music and comedy.