If you went to public school in the United States, you've probably been to a Scholastic Book Fair. Once a year, from kindergarten through middle school, one of these events would be held. A whole room would be filled with displays of books and other trinkets that you could look through and buy. At my school, there would be a smaller one you could go to during the day that was set up in an unused classroom, and the main book fair would be after school, set up in the gymnasium.