7 Worlds Collide, which also featured Radiohead's Ed O'Brien and Phil Selway as well as Glenn Kotche and John Stirratt of Wilco, played songs from upcoming charity LP The Sun Came Out.
In addition to the tracks penned for the album, the group also performed versions of Finn's Crowded House hits 'Don't Dream It's Over' and 'Weather With You' and The Beatles's 'Something', NME reports.
Finn said: "It was really sweaty out there, but that's exactly what you want from this sort of event. It covers a lot of the cracks and it gets people involved."
O'Brien added: "I enjoyed it – it was kind of flying by the seat of your pants, but it was good! There was no rehearsal at all... well, there was a bit last week with acoustic guitars, next to the pool, that's it.
"The thing is, is to carry on playing with these people. The first time it was slightly different, and for me to be playing with Wilco was a real treat. It's always nice to make music with good people, and to try and make good music."
7 Worlds Collide was the name of the 2001 live album credited to Neil Finn & Friends.
The project has also featured input from Johnny Marr, KT Tunstall, Liam Finn and others.
The Sun Came Out is released in single and double-CD versions on August 31, with proceeds donated to Oxfam.