4. Putting gift registry information on the invitation. That's a big Don't. Registry information can go on your personalized wedding Web site and in shower invitations, but never on wedding invitations...not even informal ones. You can enclose a card with your wedding website, though. They'll find out your registry info along with their travel and hotel info.

5. Putting 'And Guest' when the recipient is in a long-term relationship or is engaged. Again, this is a research thing. Find out the names of your guests' guests - you can call them directly if you have never known their significant other's name, or ask a friend or relative for the info. It's a gracious move that is the essence of good invitation etiquette.

Sharon Naylor is the author of The Essential Guide to Wedding Etiquette. Ask Sharon your etiquette questions on iVillage Wedding's Ask the Etiquette Expert message board.

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