This game is the perfect door prize game, and usually a nice surprise for the winner. Take a penny and tape it under one of the chairs your guests will be using. Don’t let on about the penny until after all the guests have arrived and are seated. Then ask your guests to look under their seats. The guest who finds the lucky penny taped to their chair wins a prize!
For a more personal touch you could use a small photo of the bride, or of the couple, to tape under the chair. For a themed event, use an item to match the theme such as a flower for a garden party or shell for a beach themed shower. Just make sure that you can’t see the item taped under the chair until they are looking for it or some of your guests might catch on.