Our venue is downtown, so they get a list from us of all the guests so we don't have anyone wander in. If someone that isn't on the list shows up, they come and check with the bride or groom to see if they should allow them in (and if we'd like to incur the extra cost if we don't have a seat reserved for them). I'm not sure how to word this diplomatically... the following is what I have on our wedding website, where most people will be RSVPing. Any suggestions? Do I need to specifically say anything more forward than this?
Our RSVP page is set up with the names of all invitees; if you can't find your name or the name of someone you're hoping to bring, please let Emily or Alex know! Since the venue is in the heart of downtown, there will be a guest list at the door with the names of everyone who RSVPed. If you'd like to bring someone that isn't on your RSVP on this page, please let us know in advance and we will do our best to accommodate them and get them added to the list!