NEW YORK--(BUSINESS WIRE)--Barnes & Noble, Inc. (NYSE:BKS), the nation’s largest retail bookseller and the leading retailer of content, digital media and educational products, is inviting customers to take part in a special To Kill a Mockingbird Book Discussion event at all stores nationwide on Thursday, May 14. The first in a series of events at Barnes & Noble in celebration of the highly anticipated July 14 release of Go Set a Watchman, this will be a dynamic book discussion about one