Allow my to preface this question by saying that throughout the wedding process, I've discovered that my FMIL is nuts. This past weekend, she left FI a voicemail saying she would be using FBIL's invitation to invite additional people but we don't need to worry about getting her a new envelope, she'll just buy a plain one. I had been super worried about this and therefore hadn't given her her invitation yet. Can't believe I didn't think about not sending FBIL's! Oh well, we had him find his invite, which she never gave him, and take it out of the house. So, now I'm insanely worried that she will be inviting additional people. What are some suggestions for making sure uninvited guests don't crash? FI and I don't know all of the people on her guest list and wouldn't know if they were invited or not. My coordinator suggested having someone by the door as guests enter the ballroom checking their escort cards. Any other thoughts?