What do you get when you cross a vaudeville band, two rock groups, a brass band and a theatre troupe? The best 50th anniversary celebration ever, apparently. Head down to Indigo at the O2 to catch The Bonzo Dog Doo Dah Band as they take to the stage for their anniversary concert. They'll be joined by loads of special guests, including The Rutles, The Keem Sham Brass Band, The Desperate Men Dada Theatre Ensemble and loads more. It doesn't get much bigger than this. Over 14s only.