Got any ideas on those scenarios I posted?
Scenario #1
First of all he could ask how she feels about his idea of going out. She might not mind putting the food she made up for a later meal.
If she isn't happy about his idea they should negotiate. Maybe they go out for ice cream after eating dinner at home. Or maybe they go out and do something that doesn't involve food after eating dinner at home. Or maybe he brings home something "extra" to contribute to a celebratory meal and atmosphere.
The default is to stay home until/unless they reach a mutually enthusiastic new arrangement.
So if they haven't been able to negotiate and dinner time arrives, since eating is a health issue, at least the kids ought to be fed whatever is prepared while they continue to negotiate.
If he gets angry then she should remove the kids and herself from his presence. The same if a verbal attack begins accusing her of not caring about his promotion,etc.
So what should she do if he doesn't ask and walks in and gets
the kids excited about going out and she is the only one unhappy?
#2 the default is for him not to go unless she is enthusiastic.
They can negotiate to try to reach a solution in which he/they go with her/the family's enthusiastic support.
I don't know if family night stays on as planned though if no substitute solution is negotiated. ??? Do the kids/everyone sit around doing nothing?
What should she/the family do if he ends up staying home because no enthusiastic mutual agreement for going is reached and he is moody, grouchy, or non -participatory in the previously scheduled plans?