My husband’s grandparents had a house like that, apparently. They were next door to the old General Store in a small town, and his great-grandfather had owned the store (it was still open when his mother was a teenager, and she worked there). People were in and out constantly. There was always pie and coffee. Every morning grandpa would fry a pound of bacon, then deep-fry at least a dozen eggs in the grease, for anyone who stopped by at breakfast time.
I have some friends who love to receive drop-in visitors - even (in most cases) if they are entertaining guests when it happens - I found it a little disconcerting the first time I experienced it, but it seems to work for them and all of their friends and relatives know about it, so it’s just an accepted part of the way things work.