Looking to meet some of your favorite authors, NBA stars, or characters from your favorite PBS kid’s shows this weekend? The Library of Congress and first lady (and former librarian) Laura Bush bring the 2004 National Book Festival to the Mall on Saturday. Now in its fourth year, the festival features more than 70 writers from across the literary spectrum. Notables appearing include R.L. Stine, E.L. Konigsburg, Joyce Carol Oates, Clive Cussler, Azar Nafisi, Anna…