Darkness at 3AM: Bono and Macca bend space, time

This came from yesterday's 3AM:

Paul McCartney took bezzie mate Bono on a Magical Mystery Tour of his old Liverpool haunts before they both flew into town for the awards.

Leaving aside that Macca has gone to Liverpool so infrequently in the past three decades it'd be like getting a tour of London from Boudaceia, how exactly did McCartney give Bono a tour before they went to the city?