This would be a good read for when a class is discussing the Civil War and/or slavery. The book keeps in a positive light in that Sundays were free for slaves.
Freedom in Congo Square written by Carole Boston Weatherford. Caldecott Honor Book. This book follows the weekly schedule by day of a slave and what work they were forced to do. However, on Sunday afternoons, slaves were able to spend half the day in Congo Square and feel free.