Wrocław: the Peace Congress gathers dozens of intellectuals, including Pablo Picasso, Louis Aragon, Irène and Frédéric Joliot-Curie, Paul Éluard, and Ilya Ehrenburg. Gdynia: 40 members of the “Service to Poland” organization sail to Leningrad. Kraków: sea scouts embark on a voyage upstream the Vistula River, returning home via the Oder.