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Add this to the top of your user or user talk page and modify to suit your needs:
{{#invoke:String|sub|s={{Wikipedia:The Night Before Wikimas}}|{{#invoke:String|find|{{Wikipedia:The Night Before Wikimas}}|{{=}}{{=}}}}
|{{#expr: {{#invoke:String|find|{{Wikipedia:The Night Before Wikimas}}|More rapid than eagles}}-1}}
}}
{{collapse top|... the rest of [[Wikipedia:The Night Before Wikimas]] ...}}
{{#invoke:String|sub|s={{Wikipedia:The Night Before Wikimas}}|{{#expr: {{#invoke:String|find|{{Wikipedia:The Night Before Wikimas}}|More rapid than eagles}}-1}}
|-1
}}
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On Christmas, you can see it in action on my talk page. The magic is actually in User talk:Davidwr/header, with the line
{{#ifeq:{{is now|format string=m-d|at1=12-25}}|1|{{User:Davidwr/The Night Before Wikimas (top)}} }}
Since it's not Christmas year-round, here's what it looks like in action, with a minor change to avoid creating a new section.
T'was The Night Before Wikimas
'Twas the night before Wikimas, when all through the Teahouse
Not an editor was stirring, not even a mouse.
Most editors were nestled all snug by their beds,
While visions of new articles danced in their heads.
When out from a keyboard there arose such a clatter
I sprang to my screen to see what was the matter.
When, what to my wondering eyes should appear,
but a question on sources and how to use them well here.
As dry words that before an old dictionary fly,
when they meet with a synonym, mount to the sky,[citation needed]
So, onto these articles the edits they flew,
With a sleigh full of facts, and citations, too.
And then in a twinkling, I saw on the page
Our wiki-creator: a man of great age.
As I checked it on Commons and was turning around,
Down my router St. Jimbo came in with a bound.
He sprang to his sleigh, to his team gave a whistle,
And away they all flew, leaving me to my epistle.[anachronism]
But I heard him exclaim, 'ere he drove out of sight, "Happy Editing to all, and to all users a good night!"[This quote needs a citation]