Guests need structure! They need to know who, what, when, and where. But there are some other details guests would appreciate knowing. It's slightly irritating receiving an invitation and still not getting some basic information about their wedding. Make sure you let guests know who is invited, especially if you are planning an 18+ wedding. The dress code is also a big one… whether casual or formal, it will help your guests navigate their wardrobe. And obviously where and what time to arrive!