'I book-end my talk with a spacey slide show set to Elton John’s ‘Rocket Man’ and David Bowie’s ‘Space Oddity’. A man in the audience has a rock guitar and offers to play live. '

I intend to book-end my talk with a spacey slides show set to Elton John’s ‘Rocket Man’ and David Bowie’s ‘Space Oddity’ but my version of PowerPoint is incompatible with the Festival’s. A man in the audience has a rock guitar and offers to play live.