The American Legion and the DAV (Disabled American Veterans) sell poppies. The money goes to help Veterans and their families.
I learned "In Flanders Field" But don't think they still teach it as they seem not to teach a lot of stuff I had to learn back when we rode dinosaurs to school.
I have heard of a group protesting the selling of poppies here for Veteran's Day because the Afganies use poppies to produce opium and finance their terrorism and war activities against the US. I thought to myself: "PLEASE, do you not know the significance of WHY they sell poppies here?" And apparantly they did not know about the poem.
It was called Armistice Day here until after the Korean War when they decided to remember all Vets and not just the ones from WWI.
The 11th hour of the 11th day of the 11th month. I will never forget learning that either.
ETA: My family started a tradition of saving Newspapers and I have a trunk full. The oldest one has the headline: Armistice Declared and is dated Nov. 12, 1918, the day after. I have VE and VJ day newspapers too.