I live in a small community where everyone knows everyone and an "open" wedding means anyone can come. Our church holds over 400 people, but the reception site will only hold around 200. We are trying to keep the guest list around 250 (it is very hard!), but I know that there will still be unexpected guests who show up as well.
How do I tell people -- especially my family -- that if your name isn't on the invitation, you aren't invited? For example, I'm sure that any of my cousins with a significant other at the time will bring them along.
I know this is commonly known etiquette among Knotties, but not in my community.