Who Is Mr Kirby?

If you were at this year's Edinburgh Fringe, you might have spotted stickers placed, well, absolutely anywhere saying 'Who Is Mr Kirby?' Indeed, I had one on the back of my jumper for hours before I noticed… It's all to promote a part sketch-show, part-improv show, where three comedy performers try to find a replacement from the audience for their fan Mr Kirby, who has disappeared.