The 79th edition of the oldest Czech winter swimming contest will be held near the National Theatre, between Slavonic Island and Střelecký Island. The event will start at 11am, with hardy men and women in attendance. The memorial is named after Alfred Nikodém, a Prague goldsmith and a promoter of a Spartan lifestyle. Winter swimming was first seen in Prague in 1923 when Nikodém together with six other enthusiasts plunged into the freezing cold water of Vltava River watched by a crowd of stunned onlookers. More information (in Czech)