Blimey, you were up early!

Found the site you mentioned last night, as you can see.

And I have to say I really wish that you were allowed to bring your electric piano along to the acoustic night. The car battery idea might work......., no plug needed.

Seriously, there's a plethora of guitarists, and being able to add some piano at an 'acoustic' level would certainly add some colour and variety. How many of the regulars at the pub have you asked, and how many are against it?