The Tucson Festival of Books is located on the University of Arizona Mall - along East University Boulevard, stretching from the Old Main area to just east of Cherry Avenue, and in a few nearby buildings. For such a large event, the location is relatively compact.
Free public parking is typically available in the University's surface lots and in six garages: Cherry Avenue, Highland Avenue, Main Gate, Park Avenue, Sixth Street and Tyndall Avenue. (The Second Street Parking Garage is reserved.)
Further details at http://tucsonfestivalofbooks.org
FreeThought Arizona will have booth #351 and #352 at the festival.