Day 1 - https://blogs.ncl.ac.uk/speccoll/2022/12/01/christmascountdown-wwi-home-for-christmas/
Day 2 - https://blogs.ncl.ac.uk/speccoll/2022/12/02/the-girl-who-killed-santa-claus/
Day 3 - https://blogs.ncl.ac.uk/speccoll/2022/12/03/christmascountdown-thomas-baker-browns-christmas-pantomime-programme/
Day 4 - https://blogs.ncl.ac.uk/speccoll/2022/12/04/300-year-old-mine-pie-recipe-christmascountdown-door-no-4/
Day 5 - https://blogs.ncl.ac.uk/speccoll/2022/12/05/swans-lightbulb-christmascountdown-door-no-5/
Day 6 - https://blogs.ncl.ac.uk/speccoll/2022/12/06/lady-tabitha-and-us-at-home-christmas-eve/
Day 7 - https://blogs.ncl.ac.uk/speccoll/2022/12/07/christmascountdown-rounton-xmas-1919/
Day 8 - https://blogs.ncl.ac.uk/speccoll/2022/12/08/illustrated-london-news-christmas-supplement-1855/
Day 9 - https://blogs.ncl.ac.uk/speccoll/2022/12/09/william-brewis-christmas-day-1843-diary-entry/
Day 10 - https://blogs.ncl.ac.uk/speccoll/2022/12/10/the-night-before-christmas/
Day 11 - https://blogs.ncl.ac.uk/speccoll/2022/12/11/professor-duff-25th-december-1942-diary-entry/
Day 12 - https://blogs.ncl.ac.uk/speccoll/2022/12/12/christmascountdown-newcastle-beer/
Day 13 - https://blogs.ncl.ac.uk/speccoll/2022/12/13/out-in-the-cold-from-punch/
Day 14 - https://blogs.ncl.ac.uk/speccoll/2022/12/14/public-reading-of-a-christmas-carol-december-2011/
Day 15 - https://blogs.ncl.ac.uk/speccoll/2022/12/15/christmascountdown-spiral-nebula-in-the-snow/
Day 16 - https://blogs.ncl.ac.uk/speccoll/2022/12/16/christmascountdown-the-seasons/
Day 17 - https://blogs.ncl.ac.uk/speccoll/2022/12/17/the-fig-tree/
Day 18 - https://blogs.ncl.ac.uk/speccoll/2022/12/18/christmas-entertainments-prologue/
Day 19 - https://blogs.ncl.ac.uk/speccoll/2022/12/19/christmascountdown-door-no-14/
Day 20 - https://blogs.ncl.ac.uk/speccoll/2022/12/20/christmascountdown-the-story-of-a-cup-of-tea/
Day 21 - https://blogs.ncl.ac.uk/speccoll/2022/12/21/christmascountdown-crawhalls-couple-kissing/
Day 22 - https://blogs.ncl.ac.uk/speccoll/2022/12/22/christmascountdown-the-twelve-days-of-christmas/
Day 23 - https://blogs.ncl.ac.uk/speccoll/2022/12/23/christmascountdown-christmas-tree-at-windsor-castle/
Day 24 - https://blogs.ncl.ac.uk/speccoll/2022/12/24/a-very-pretty-little-christmas-carol/

It's the 28th Day of Christmas!