November 11th is Armistice Day or Remembrance Day
Armistice Day is on 11 November and is also known as Remembrance Day. It marks the day World War One ended, at 11am on the 11th day of the 11th month, in 1918. A two-minute silence is held at 11am to remember the people who have died in wars.
Poppies have long been used as a symbol of sleep, peace, and death: Sleep because the opium extracted from them is a sedative, and death because of the common blood-red color of the red poppy in particular. ... Poppies used as emblems on tombstones symbolize eternal sleep.