The tribune sums it up nice:
What a difference three decades make. The first Printers Row book fair, in 1985, featured about 40 booksellers and attracted a reported 6,500 attendees to what once had been a somewhat dicey neighborhood. Considering the crowds in recent years, the 2014 Printers Row Lit Fest is likely to attract more than 20 times that many people. The festival, which is owned by the Chicago Tribune, will host around 150 booksellers and a full slate of readings, panel discussions and other events, featuring more than 300 authors and presenters.