fiddler's bidding
An invitation given unexpectedly, usually or at the last-minute. No, I think she only invited me because I happened to call her. It's just fiddler's bidding.
fiddler's bidding
Last-minute invitation. The image is a vacancy at a dinner table to which an itinerant fiddler who appeared at the door and asked to play for food was invited to join the household at the table.