RSVPS: Whether you choose to include a card for your guests to drop in the mail, a phone number to call, an email address to reply to, or a website to visit in order to collect your RSVPs, prepare yourself to have to hunt down more than a few people, regardless of your chosen method. We saved paper by only sending physical RSVP cards to our older guests (i.e., those who do not, and never will, own a computer or a smart phone) because we knew we’d have to chase down responses anyway. So we saved a little bit of money where we felt it might be thrown away otherwise. Here are a few more tips for collecting RSVPs.
Very formal invitations include this information on a separate card. Otherwise, it can be printed on the wedding invitation itself if there is room; if the ceremony and reception are held in the same location, you may print "and afterward at the reception" or "reception immediately following." When the reception is elsewhere, the location goes on a different line.
Traditionally, the bride's parents are the hosts of the wedding, and are named at the top of the invitation, even for very formal affairs. However, including the names of both sets of parents as hosts is a gracious option no matter who foots the bill. Also, more and more couples these days are hosting their own weddings, or do so together with their parents.