My wedding is next Saturday and just today I received an RSVP from an old friend I assumed was not coming to our wedding. Our deadline was nearly one month ago (August 16th) and I am not sure what to do. I already gave final numbers to our caterers, made seating assignments and charts, and the only open seats we have are split at two tables and the friend I invited responded she was bringing someone even though there was no plus one on her invite. What is the proper way to handle this?