Super search turned up two related PM nodes:

• Twelve Days of Christmas by ibanix (2002)
• 12 Days of Christmas by zentara (2005)

In terms of code golf prior art, there has been at least:

• code.golf (12 days of Christmas) - I see the top three golfers are all Perl Monks! (primo, thospel, o0lit3). Given how low the scores are, I speculate that primo (the best code golfer of all time IMHO - and not just in Perl) has unearthed some brilliant compression hacks that have so far eluded the legendary thospel (the best Perl golfer for ten years before primo arrived on the scene) and o0lit3
• shinh golf site (Twelve Days of Christmas)

Though I'd never come across this golf before, I'm not surprised that it is a popular code golf game. Unfortunately, as with Drunk on golf: 99 Bottles of Beer, this one will almost certainly degenerate into a Compression slugfest, which in turn will depend on the game rules regarding compression.

See also: my list of PM code golf links

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