Dear Mr Fossil,
What good fortune! You are in the company of some greats!
Many Mississippi bluesment have been asked to play down in the depot; Billy Joe Royal, Kenny Loggins and Ry Cooder were all asked to play down in the boondocks; the Easy Club were often asked to play down in the wee room...
I believe it, and the accompanying chants of appreciation from your audience, to be merely a positive affirmation of your undoubted musical abilities. Alternatively, they may be used to that particular song in the key of E and may be asked you to remove your capo from the first fret in telling to to "get the F off".
I myself am often asked to play if I am going down to the woods today and reminded that there will be a big surprise for me!
Yours sincerely,
Dr. Guitar