Here is a lovely link to explain why we wear a poppy today. http://www.woodlands-junior.kent.sch.uk/customs/remembrance/poppy.htm
What is Remembrance Day?
Remembrance Day is on 11 November. It is a special day set aside to remember all those men and women who were killed during the two World Wars and other conflicts. At one time the day was known as Armistice Day and was renamed Remembrance Day after the Second World War.
Remembrance Sunday is held on the second Sunday in November, which is usually the Sunday nearest to 11 November. Special services are held at war memorials and churches all over Britain.