Christmas Eve was the traditional name of the day immediately preceding Christmas Day, on 24 December.
Due to his rudimentary knowledge of Earth, Mr Copper believed that the people of the UK went to war with Turkey every Christmas Eve, after which they would then eat the people of Turkey for Christmas dinner. (TV: Voyage of the Damned)
Every Christmas Eve, Lucie Miller laid out a trail of toast crumbs to her house, believing this would help Father Christmas's reindeer find their way. (AUDIO: Death in Blackpool)
History
In 2004, a baby girl was born at approximately 2PM, and subsequently abandoned by her mother at a church on Ruby Road in Manchester shortly before midnight. The Fifteenth Doctor arrived at the location to prevent the baby's abduction by the Goblins, which had created a cracked timeline in the future, impaling the Goblin King on the church spire and causing the goblins' ship to disappear. A vicar found the baby outside the door just after the stroke of midnight. (TV: The Church on Ruby Road [+]Russell T Davies, Doctor Who Christmas Special 2023 (BBC One and Disney+, 2023).)
In 2006, the newly-regenerated Tenth Doctor crashed his TARDIS into the Powell Estate, (TV: The Christmas Invasion) choosing the date as a Christmas present for Rose Tyler. (TV: Born Again) Later that day, Rose was attacked by Robot Santas while out Christmas shopping with Mickey Smith. When they arrived back home, they were attacked by a Roboform Christmas tree. Later that night, the Sycorax made first contact with Earth. (TV: The Christmas Invasion)
In 2017, a TV episode called Iris Wildthyme & the Mars Conundrum was aired. It was written by Paul Magrs. (PROSE: The Magrs Conundrum!)
The Eleventh Doctor and Kazran Sardick took Abigail Pettigrew out of her ice box every Christmas Eve for several years until it was revealed that Abigail only had one day left to live. (TV: A Christmas Carol)