If you like that funky, bluesy, swingy sound from the late 60s this will be your thing.
Birdie Num Nums Cafe/Bar: Sunday 3rd June, 12.30 - 3pm
http://www.greenchainquartet.com/2018/05/gcq-live-at-bnns-sunday-june-3rd.html
Parliament Hill Fields Bandstand, Hampstead Heath: Sunday 10th June 2 - 5pm
http://www.greenchainquartet.com/2018/05/gcq-live-on-heath-sunday-10th-june.html
(very interesting history to the bandstand if you are a music fan; more at above link)