If you’re going that far back means those two friends in the same city were probably going to church (or some other religious gathering) fairly regularly and would likely see each other fairly often. Enough to be able to make other plans during the week. And yes, can’t tell someone you’re running late or not showing up… if you’re late you’re late, if you don’t appear then that’ll be a conversation next time at church.

Beyond that since they’re in the same city those friends likely go to the same pub(s) or other places and see each other that way.