What are your plans for a week today? Well, ok, I should specify that it's next Saturday evening? Whatever it is cancel it for Mick Jagger is hosting and performing on Saturday Night Live's season finale, May 19th. Not only that but now reports are coming in along with tweets that his backing band will consist of not one but two Grammy award winning bands: Foo Fighters AND Arcade Fire. So that important meal you had planned with the family, cancel it.