Summer hasn’t (officially) started yet, but the literary world is already revving up for September: Publishing houses have started sending out their fall releases, and in New York, the Brooklyn Book Festival, one of the city’s largest book events, is assembling this year’s roster.

Mira Jacob, Rebecca Traister, N. K. Jemisin and Meg Wolitzer are among the more than 150 writers confirmed to attend the festival, which runs Sept. 16-23. That number is sure to balloon by the end of the summer; last year, more than 300 authors participated. The event includes a full day of adult programming and another for children.

Mo Willems is this year’s winner of the Best of Brooklyn award, which is presented annually to a writer who “exemplifies or speaks to the spirit of Brooklyn.” Willems is the first picture-book author to receive the award and joins such previous winners as Jacqueline Woodson, Colson Whitehead and James McBride.

Willems, the Caldecott-winning author of books like “Knuffle Bunny: A Cautionary Tale” and “Don’t Let the Pigeon Drive the Bus!” was one of the writers who “jumped right on board” when the Brooklyn Book Festival began in 2006, Liz Koch, one of the festival’s co-producers, said.