An official memorial event will mark the 75th anniversary of the liberation of the Nazi death camp on 27 January, International Holocaust Remembrance Day. Up to 200 Holocaust survivors who were imprisoned at the camp will attend, along with heads of state from at least 22 countries. A ceremony at 3.30pm will be addressed by survivors, Poland’s president Andrzej Duda, and Ronald Lauder, president of the World Jewish Congress. It will end with the kaddish, the Jewish prayer for the dead.