Having your guest names printed directly onto the invitation will certainly clear up any confusion as to who is invited to your wedding. However if you feel it is not necessary to personalise each invitation, here's the other way to avoid awkward situations of people attending with an uninvited guest.
You can simply address the envelope with the names of your intended guests and hope that common sense is prevalent. Most times it gets the message across and if your guests are unsure they will contact you. Some couples add text such as "strictly invites only" or "no kids" to the RSVP. If you are inviting a guest that may bring a partner but you're unsure of their name, you can add "and guest" (although I personally think it's nicer to find out their name - especially if they are coming to your wedding!)
We provide the service of personalising your invitations with guest names so just let us know in the consultation if this is something you are after.
There are a few ways to tackle this depending on how you would like to address it.
1. Being subtle and addressing the envelope to the adult recipients only.
This method isn't foolproof though, as some guests may not get the hint that children are not invited.
2. Being blunt and straightforward.
This will definitely get the message across but you may have to be cautious when dealing with sensitive guests.
"Sorry, no kids."
"Please note that this is an adults only wedding and reception."
3. Asking in a polite manner to respect your wishes.
"We respectfully request no children under 16 at the reception."
"As we would like to keep this wedding adults only, we kindly request no children be brought to the reception."
What if you are having children from immediate families attend?
"While we would love to have everyone attend our wedding, unfortunately we can only accommodate guests who were named on the invitation."