According to Tobias Schlegl, host of the show 'Kewl' on german music channel VIVA, The Artist will appear tomorrow (thursday) live in one of their shows ! He just mentioned it in his show when he announced the video 'When doves cry'. Right after he said that, someone behind the camera was whispering to him, maybe the producer, and then he said 'Oh this is still a secret, sorry !?!'
He didn' t say when or in which show, so force yourself to watch VIVA all day long. My suggestion would be the show 'Interaktiv' from 3 to 5 p.m.. VIVA is located in cologne, just a few kilometres away from the studio where The Artist will tape the Harald Schmidt Show the same day. I heard rumours that the soundcheck for that show begins a 4 p.m. (it' ll be taped at 6 p.m.), so he has enough time to visit VIVA before! But maybe it' ll be in another show or he' ll tape something, so keep watching !