2. Invitation confusion.
There is nothing more frustrating than when a guest assumes they're receiving a plus-one you had no intention of inviting.
How to deal: Don't dodge the question — it will only make things more awkward. Be sure to address your envelopes using the proper etiquette. Concerned that's too subtle for your guests? Another way to make it clear-cut is to write the names of the guests you want to invite on the response card and having them check off a "will attend" or "will not attend" box.
Photo Credit: Pearl Beach Paperie