Let your busy guests know when you’re getting married so they can keep the date free to celebrate with you! Save the Date Cards For Weddings are a short and sweet note that let your guests know what date you and your honey will be getting married. The cards are usually sent out at least six months before the big day - your Wedding Invitation is sent a few months later. Save the Date cards aren’t a necessity, but they’re very helpful for guests who are coming from out of town and need to make hotel arrangements or guests who have very busy social calendars.