We had guests in the gîte this weekend, 29 in total, and we prepared a special birthday dinner on Saturday night, and a brunch on Sunday morning. They were very happy.
One of the things you don't need to discover on a cold night, when in the middle of cooking and serving an evening meal for 29 guests, is that the heating system has stopped. Strategy for dealing with it: switch the hot water to electric immersion heater so that people will at least be able to shave and shower in the morning; carry on serving the meal as if all is well; see if the heating can be fixed once the meal is done and dusted.
So at midnight, I'm diagnosing the boiler, taking the wood feeding mechanism apart, and fishing out the pictured wodge of wood that is far outside of the specs the supplier is supposed to stick to, (AA battery for size comparison,) and that has jammed the system, Then restarting the boiler, making sure all is well before retiring at 1.00AM. The guests never noticed a thing.