A colleague of mine keeps a notebook in her kitchen drawer, specifically to note down details of what she has served to guests. Eg "sept 2018, bob and Jill for dinner, lasagne then cheesecake"
This is so she doesn't serve the same people the same thing the next time they come for dinner.
AIBU not to do this? Am I a bad host for not caring about these details? I would never think to ensure I offer a different meal next time. Does she have too much time on her hands?