Several publishers across the country held parties as staffers donned costumes based on favorite characters and books. See our collection of photos from the festivities.


At the HarperCollins Children’s Books costume party, (from l.) Nicole Wills, Lauren Tambini, and Sari Murray of the early readers’ marketing group paid tribute to A Spoonful of Frogs by Casey Lyall, illustrated by Vera Brosgol.


(From l.) Diana Huang, Matt Corcoran, and Menucha Gurkov, members of HarperCollins’s finance team, dressed as The Food Group from Jory John and Pete Oswald’s bestselling series.


Meet the cast of The Outsiders, otherwise known as the HarperCollins marketing operations team: (front row, from l.) Anais Villa Gray and Alison DeMartino; (back row, from l.) Rae Gande, Sam Main, Ann Dye, and Benny Sisson.


Goodnight Moon came to life in a group costume by Mimi Rankin (l.) and Blake Hudson.


Halloween, or rather “Harperween,” was a big success for the whole children’s department.


Staff at Chronicle Books dressed up as characters from the Shrek films while showing off some of their favorite picture books.


Chronicle staffers hit a home run with baseball-themed costumes.


Children’s publishers Holiday House, Peachtree, and Pixel+Ink held their Boos & Books Bash both in-person and virtually. Here, the New York office dressed as their favorite books.


The smaller yet mighty Peachtree contingent in Atlanta.


Levine Querido staffers (from l.) Irene Vasquez, Arely Guzman, and Kerry Taylor dressed as their favorite LQ books.


At Little, Brown Books for Young Readers, members of the Christy Ottaviano Books team (from l.) Leyla Erkan, Christy Ottaviano, and Jessica Anderson dressed up as characters from Nancy Drew and Knight Owl.


Alvina Ling gave a sneak peek of what’s to come, dressed as Lily from the forthcoming picture book This Is Not My Home.


(From l.) Victoria Stapleton, David Caplan, and Megan Tingley brought their own Halloween style in their role as judges for LBYR’s costume contest.


The LBYR group, in all their regalia.


(From top l.): Scholastic's Daniela Escobar as Katie from Sometimes I Grumblesquinch; Victoria Velez as Pig the Pug from Pig the Rebel; Amanda Trautmann as NoFuzzball from No Snowball!, Seale Ballenger as Slappy from Goosebumps; Elisabeth Ferrari as a Traveling Publicist; (from bottom l.) Lia Ferrone as Leon from Leon the Extraordinary; Brooke Shearouse as the caterpillar from The Very Hungry Caterpillar; and Aleah Gornbein as the grandmother’s garden from The Glass Witch.


The team at Little Bee Books got into the Halloween spirit with a variety of costumes.


First Book joined in the fun, too; (from l.) Lee Butler, Cecilia Cackley, Lori Prince, Alison Morris, Jack Pando, and Paula Willey of First Book’s title selection and merchandising teams brought characters from Casey Lyall and Vera Brosgol’s A Spoonful of Frogs to life and gave a performance of the book.