WASHINGTON, April 3 -- The U.S. Postal Service issued the following news release: * * * 'Goodnight Moon' stamps to be unveiled May 2 What: The U.S. Postal Service will unveil its Goodnight Moon stamps at The Rabbit hOle in North Kansas City, MO, on May 2 as part of an event leading up to Children's Book Week (May 5-11). The Rabbit hOle is a new museum experience that celebrates and brings to life a century of American children's literature, including Goodnight Moon, for visitors of all ages  more