I was informed by a relative today that not adding a plus one to a guests invite is very rude if there is going to be a dance because that person will not have anyone to dance with. I hadn't seen that one on this board so was pretty sure that was not the way it worked. I let her know that we invited our friends and family and their SO but if this guest would like to bring a date that would be fine with us and could add the name to the RSVP.
This was only ok because we have had some no responses so we know we are not over our budget/space restriction.
What should I have said if we were maxed out space wise for the venue ?