My FI and I decided to only let people bring a guest if they were in a relationship. For these cases, we made a point to include the name of their significant other on the invitation. We'd love to let everyone bring a guest but with a huge family and limited space, it just isn't going to work.
My MOH just commented, "hopefully all the single people don't RSVP for 2 and drive the numbers up." Is this something that should happen? We made a point to just put Mr. John Smith, etc on the invites. I'm starting to worry that more people will RSVP than we have space for.