The food was good, the company was good.
The toilet upstairs clogged beyond the ability of the plunger to deal with, but with a little help from this video I was able to use the toilet auger to clear it.
(Yes, I carefully watched the video before making the attempt, having not yet successfully used the auger before. I was immediately amused by the discussion of the difficulty of getting a plumber on Christmas Eve...)
But all's well that flushes well or something like that.