I am in the midst of planning my wedding, and have had many friends ask me if we will or will not be allowing guests to bring “plus ones.” I recently sent out an email to clarify what we are thinking.
This is how I'm dealing with my “plus one” situation. Perhaps you'd like to steal this wording:
Your invitation will likely be addressed to you only (unless your significant other is cooler than you, in which case it will only have their name on it). Now, if there is someone special in your life that you would like to bring, please email us and include them on your RSVP.
However, if you feel like you might end up wanting to ditch them to dance your face off with old friends, do your relationship, and your wallets, a favor and don't bring them. Make sense?
We trust that you all will make the right decision for yourself, and if you don't, we're sorry.