Help me with RSVPs

Ive been trying to figure this out. My RSVPs are like this:

M.____________
__will attend
__will not attend

I wanted to put a line for # of guests and I forgot. Theyre already made. How should I fill the RSVPs card. I have to regulate who people bring because Im already seriously over my limit and I dont want people writing in who theyre bringing because Im not inviting everyone with a guest. Does anyone have any clue what I should do to make sure no one adds in extra people?

the proper etiquette for geusts and rsvps is that whoever is listed on the inside envelope are the real invitees. You may want to also use that rule for who is put on the outside envelope too.

That's the best I can say, unless you want to re-order the rsvp cards...