My uncle died unexpectedly a few months ago, and so the invitation I sent to my aunt included only her name and her daughters name (originally it would have been the three of them, of course). Now she has RSVP'd for herself, my cousin, and another woman's name that I don't recognize. Maybe she thought since originally I had allotted 3 spots for her party, she gets to bring another person?
Would it be totally insensitive of me to do the usual in the unexpected +1 situation, where you call and let the person know that unfortunately due to restrictions on the venue size you will be unable to accommodate additional guests? Was it wrong of me in the first place to invite an additional person as a result of having a slightly smaller guest list than expected?