Victory in Europe Day (V-E Day or VE Day) was on May 8, 1945, the date when the World War II Allies formally accepted the unconditional surrender of the armed forces of Nazi Germany and the end of Adolf Hitler's Third Reich. On April 30th, Hitler committed suicide during the Battle of Berlin, and so the surrender of Germany was authorized by his replacement, President of Germany Karl Dönitz. The administration headed up by Dönitz was known as the Flensburg government. The act of military surrender was signed on May 7 in Reims, France, and May 8 in Berlin, Germany. 8th of May is a public holiday in the former East Germany (Tag der Befreiung - Day of liberation), in France, in Slovakia (Deň víťazstva nad fašizmom - Victory over Fascism Day) and in Czech Republic (Den vítězství or Den osvobození - Day of liberation).
This photo does not really illustrate VE day, but rather Armistice Day (11th of November, 1918) or Remembrance Day or Veterans Day or, and the poppy plant is the symbol for the dead World War I soldiers, but also Remembrance of all soldiers who died since World War I.