Depending upon which version one sings, THE OLD SUNDAY DINNER describes the eponymous meal as "the peace and goodwill in the month of December"
The Old Sunday Dinner
I included an unaccompanied version of it in a yuletide show last year.

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Charlie McGonigle (James Eoghain), singing " The Old Sunday Dinner" on ITMA plus information     https://www.itma.ie/digital-library/sound/old_sunday_dinner_charlie_mcgonigle_james_eoghain
MUDCAT Origins: Ye Old Sunday Dinner    /mudcat.org/thread.cfm?threadid=144188
Other recordings on YouTube     https://www.youtube.com/results?search_query=The+Old+Sunday+Dinner