Exem (Emmanuel Excoffier) is a Swiss artist in the ligne claire style, most active in poster work. For Fumetto, the International Comix-Festival Lucerne 2013, he was artist in residence, working in public in the Hotel Schweizerhof Luzern, for which he created this promotional poster. (The artist dropping his pages in the foreground is a self-portrait. Pictures from the event here.)
Journal de Spirou #4078 (8. June, 2016) is actually the four thousandth issue of the Journal (because when the magazine adopted continuing numbering instead of within-year numbering after the war, they simply counted the number of weeks since the first issue, even if no magazine had come out that week). For this occasion, the magazine features a selection of “scoops” from the history of the magazine, as told and illustrated by Fred Neidhardt. This includes a crossover between Spirou and Tintin!