Kieler Woche (Kiel Week) is an annual sailing and cultural event in Kiel, Germany that started in 1948. To promote the event, the organizers hold a competition to design the official poster. Starting in 1959, only five designers are invited each year to submit a design. Past winners and contributors include Wim Crouwel, Josef Müller-Brockmann, Ben Bos, Celestino Piatti and Anton Stankowski. The poster pictured here was designed by the great Swiss designer, Jean Widmer. I personally can’t find Brockmann’s design, so if anyone has any info, please contact me.
The official site for the event has an archive of all of the winning designs dating back to 1948. There’s also some more info on the event in the AIGA Archives, as well as a book on the subject published by Lars Müller Publishers.