The original Secret Policeman's Ball was set-up by the members of Monty Python and they brought in Peter Cook and Dudley Moore, and over the years they brought in new talent like Rowan Atkinson and later on Stephen Fry and Hugh Laurie.  And fantastic, famous music guests like Sting, Pete Townshend, Eric Clapton, Kate bush, Jackson Browne, Peter Gabriel, Jeff Beck...  Shout Factory put them on DVD (which is how I saw them) and they're worth a watch (I forgot to mention that the "new" special had a long performance by Mumford And Suns and Coldplay).