There is a website called “la blogothèque” that has invented what they call “concerts à emporter” ie “take away concerts”. The principle is simple: an artist plays in common places such as a parking lot, a street or a store; artists participating belong to independent record companies and are not mainstream at all so usually nobody recognizes them. It is really fun to see how people react to those unprompted (and obviously acoustic) shows and to see how the magic of the music operates.
Here is the video of the Cold War Kids “take away concert”, filmed last February:
Take away more concerts at la blogothèque.