did they play football on christmas day in ww1
Yes, in 1914 as a part of the Christmas truce between German and British troops.
Christmas truce
Many accounts of the truce involve one or more football matches played in no-man's land. This was mentioned in some of the earliest reports, with a letter written by a doctor attached to the Rifle Brigade, published in "The Times" on 1 January 1915, reporting "a football match... played between them and us in front of the trench". 
wiki:19100560
Christmas truce [SEP] Football matches
Many accounts of the truce involve one or more football matches played in no-man's land. This was mentioned in some of the earliest reports, with a letter written by a doctor attached to the Rifle Brigade, published in "The Times" on 1 January 1915, reporting "a football match... played between them and us in front of the trench". Similar stories have been told over the years, often naming units or the score. Some accounts of the game bring in elements of fiction by Robert Graves, a British poet and writer (and an officer on the front at the time) who reconstructed the encounter in a story published in 1962; in Graves's version, the score was 3–2 to the Germans.