Limited guest list - No plus ones

Let me ask...by "plus one" do you mean a guest of their choosing? Or are you cutting people's spouses, significant others, etc? If it's the latter, you're probably better off not inviting the couple at all, because you can't exclude those people.

Don't do a ticket--that's tacky. Address the invites to only those invited. It's acceptable to mention on the RSVP card how many seats are reserved. There are mixed opinions about mentioning adults only on the invite--I don't find it that offensive. Either way, you can put it on the website.

@futuremrslav said it perfectly. Note the number of 'seats reserved' for them on the RSVP card, and maybe start spreading by word of mouth that seating is limited at the venue so extra guests can't be accommodated on the day-of.

I'm not cutting people's spouses or significant others, only friends/family who are single will not be given a plus one. Thanks for the advice!

As stated, just address the invitations to whomever is invited. For my RSVP's I hated the wording "XX seats were reserved in your honour" so instead I chose to also address my RSVP's. It worked out well for us.

Also it's difficult to invite some children, but not all. Will the children that are involve be part of the wedding in any way?

I added a small separate card on top of the RSVP that X amount of seats were reserved in their honor. I didn't think to put it on the RSVP before they were printed. I also placed on the website (not that anyone is looking) that because of space, invitations were extended to addressees only or something like that.

Yes, the children who will be there will all be involved as jr. bridesmaids/jr. groomsman/flower girls.

I would just spread the message through word of mouth.

We're only inviting people we know, so if we've never met someone's s.o. and/or they haven't been dating for long they're not invited. We put a polite message to this effect on our wedding website and have spread the news by word of mouth to as many of our friends as possible. We'll see what happens...

Im going to address the invitation to the specific people invited. Plus I'm hoping most will RSVP on the website which only allows RSVP for the names I've added. I'm still using a RSVP card just crossing fingers for website lol