Too jazz for me ...

[Happy Jack]

... but would be right up the street of some Basschatters, I'm sure.

https://www.gumtree.com/p/other-musicians-wanted/bass-player-wanted-for-london-open-mic-night/1281274037

 

[discreet]

Just says AW is a jazz singer and songwriter.
The 'night' itself is non-specific... you could probably rock up and bang out your Geezer chops, no problem.

Edit. I won't be, though.

Edited January 2, 2018 by discreet