Private party

From CavernClub.org:

Paul McCartney held his end of world tour party at the Cavern Club. For the people who came to the door of the Cavern Club that night, the poster on the door told them it was a private retirement party. Little did they realise that Paul McCartney was downstairs.

The following day Paul performed to an audience of 30,000 on an outside stage at King’s Dock.

(The page mentions May 31, when other sites refer to May 30)

From norwegianwood.com:

Sir Paul McCartney went back to his roots by playing a secret gig at Liverpool’s Cavern Club. An audience of 180 close family and friends were at the one-off show. Pregnant wife Heather danced as Paul joined the band Love Train on stage for a set including versions of We Are Family and Let it Be. Cavern owner Bill Heckle said: “He was dancing the night away and enjoyed every minute“.

Cavern Club

This was the 2nd concert played at Cavern Club.

A total of 3 concerts have been played there • 1999 • Dec 14 • 2003 • May 30• 2018 • Jul 26

Setlist for the concert

1. We Are Family

   Written by Bernard Edwards, Nile Rodgers

2. Let It Be

   Written by Lennon - McCartney