Roma Holocaust Memorial Day is a memorial day that commemorates the victims of the Sinti and Romani Holocaust, which resulted in the murder of an estimated 220,000–500,000 Sinti and Romani people by Nazi Germany and its collaborators during World War II. The date of 2 August was chosen for the memorial because on the night of 2–3 August 1944, 2,897 Roma, mostly women, children and elderly people, were killed in the Gypsy family camp (Zigeunerfamilienlager) at Auschwitz concentration camp. Some countries have chosen to commemorate the genocide on different dates.