Unless your rehearsal dinner guest list is ten or less, you should send out dinner invitations. Your guests will appreciate knowing where to be and when. These invites, however, should not just be added to the wedding invitation envelope. Rehearsal invites should be sent out separately from the formal invitations. Otherwise, your guests could miss them. The rehearsal dinner invitations don't have to be letterpress creations on glitzy card stock but there are some very fun and creative ideas on Etsy.