Library Card Sign-up Month - http://www.ala.org/librarycardsignup - is September of every year. For this month-long event, the American Library Association and libraries across the country remind parents that the most important school supply of all is @ your library® - it's your library card.
September was first so designated in 1988, as a continuation of a national campaign launched the previous year. Read a thoroughly-detailed accounting in the August 24, 2015 entry at the American Library Association Archives Blog, A Library Card for Every Child: Library Card Sign-Up Month, by Cara Bertram.
Next occurrence: September 2016
Free promotional tools (PSA, banners for use with social media, etc) featuring this year's Honorary Chairperson now available at the official page, September is Library Card Sign-up Month.
Library Card Sign-up Month Honorary Chairpersons
2015 Snoopy, the world-famous beagle featured in the Peanuts comic strip
2014 Stan Lee, co-creator of Spider-Man, the Hulk, X-Men, Iron Man, and the Fantastic Four
2013 NBA two-time All-Star Luol Deng
2012 NFL two-time Super Bowl winner Troy Polamalu
2011 Baseball Hall of Famer and author Cal Ripken
2010 NBA Star and Olympic Gold Medalist Dwyane Wade
2009 WNBA Star and Olympic Gold Medalist Candace Parker
2008 Kareem Abdul-Jabbar, NBA's all-time leading scorer and author
(Prior to Honorary Chair designation) Library Card Sign-up Month Spokespersons
2007 Ben Roethlisberger, quarterback of the 2006 Super Bowl champion Pittsburgh Steelers
2006 George Lopez, actor-comedian and author
Last updated: September 2015