This is the sixth or seventh year I've attended the BEA-- Book Expo America. It's always a great experience. First, it's much more than just a book show. So much of publishing is electronic nowadays. The show draws thousands of visitors. it's massive. One reason it's so big is that it covers so many areas--
E-book formatting, distribution, etc.
Adult, young adult, teen, children's products
Author / book promotion
specialty writers groups, like mystery writers, horror writers, romance writers
International Publishers from China (a huge showing) Saudi Arabia, Oman, Roumania, Spain, Italy, strong Canadian representation.
Business to business publisher services
Book review orgs
Professional books for health care, law, test preparation