"Poppy Day" is Remembrance Sunday - Sunday nearest Nov. 11 (I think) which was Amistice Day at the end of the First World War. The reference is unfortunate since the IRA chose to bomb a memorial service in Enniskillen on that day some years ago.

The King Billy statue was mentioned earlier. I'm not sure if there is any specific reference in King George, or the "Lion and Unicorn" - other than that the latter feature on the heraldic arms of England.

Regards