(Materials- Calendar with large calendar month dates, highlighter pen, and normal pen).
Have the calendar of the month that the mother-to-be's baby is due at the front door for guests when they arrive. Each day is divided into two parts: am and pm for the guests to choose from in picking the date and general time the baby will be born. Make sure to have the due date highlighted. Guests can "buy in" to a lotto ticket for a certain day (am or pm) that they think the baby will be born. The guest who guesses closest wins a baby shower gift, of course given after the baby is born. The fun part of the game is that the lotto tickets can be purchased by using something other than money that is useful to the parents. Instruct guests beforehand that a lotto tickets may be purchased with a diaper pack, baby bottles or baby wipes, etc