May 9, Russia celebrates the victory over Nazi Germany, while remembering those who died in order to achieve it. On 9 May 1945 (by Moscow time) the German military surrendered to the Soviet Union and the Allies of World War II in Berlin (Karlshorst). Victory Day (День Победы Den Pobedy) is by far one of the biggest Russian holidays. It commemorates those who died in WWII and pays tribute to survivors and veterans. Flowers and wreaths are laid on wartime graves and special parties and concerts are organized for veterans. In the evening there is a firework display. A huge ground and air military parade, hosted by the President of the Russian Federation, is annually organized in Moscow on Red Square. Similar ground, air and marine (if it is possible) parades are organized in several other Russian cities (which are Hero Cities or have military district or fleet headquarters primarily).