Should I allow single guests to bring a date or plus 1?

It is customary in weddings to offer each guest at least a plus one, especially if they are invited alone and not part of a couple. No one likes to show up to a wedding alone, and many people might not even come if they have to. But if you want to ensure each guest doesn’t bring their entire family, you can specify on your invitations that it will be an adult only event.