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

Little, Brown’s production staffers (l. to r.) Brigid Black, Ankur Ghosh, Erika Schwartz and Rebecca Westall dressed up as CatStronauts, from a forthcoming graphic novel.

A varied group of Little Brown staffers: (from l.) Jon Reitzel as Frankie Stein from the Monster High series; Marisa Finkelstein as Sophie Hatter from Howl’s Moving Castle; and Aram Kim as the little boy in You Don’t Want a Unicorn.

LBYR’s Hannah Milton, Nikki Garcia and Aneeka Kalia as Puppy Pool Party!

Scholastic designers dressed up as Lego Batman.

The Graveyard of Dead Harry Potter Characters, aka Scholastic’s production team.

Scholastic’s publicity team came as A Bad Case of Stripes by David Shannon.

Here’s the children’s editorial team at Abrams dressed as Miss Greer and her students from Andrea Beaty’s picture books Iggy Peck, Architect; Rosie Revere, Engineer; and Ada Twist, Scientist: Andrew Smith as Iggy Peck, Courtney Code as Rosie Revere, Traci Todd as Ada Twist, and Jody Mosley as Miss Greer.

Abrams’s Jason Wells drew on some divine inspiration.

HarperCollins designer David Curtis, in a high-concept costume, promised to have final art before Thanksgiving.

Rebecca Schwartz from Harper’s Katherine Tegen imprint put on her best Cranky Ballerina pout.

The design and editorial team at Macmillan’s Imprint were Super Happy Party Bears.

That’s Jean Feiwel as the Queen of Hearts from Marissa Meyer’s Heartless, and Holly West as Carmen San Diego.

Macmillan’s Johanna Kirby as Agent Scully from The X-Files: Origins, and Kat Brzozowski as A Unicorn Named Sparkle.

The Gravity Falls Team at Disney: (from l.) Emily Meehan, Frank Bumbalo, and Elke-Villa.

First Book’s marketing and communications team channeled both Dr. Seuss and Lin-Manuel Miranda, dressing (and performing!) as Alexander SamIAmilton.

The Marketplace team at First Book waddled through the staff party dressed as penguins (and wise walrus!) from Penguin Problems by Jory John and Lane Smith.

Candlewick staffers (from l.) Christine Engels (as Jon Klassen) and Jamie Tan and Allison Hill (as the shifty-eyed turtle protagonists of We Found a Hat) contemplate the eponymous hat.

Also at Candlewick, those are staffers Andie Krawczyk, Rachel Johnstone, Anna Gjesteby, Dana Eger, and Erika Denn in their natural habitat.

Dial Books for Young Readers and Kathy Dawson Books staffers took a spin as a roller derby team, inspired by Victoria Jamieson’s Roller Girl : (from l.) Jasmin Rubero as Katniss EverMean, Stacey Friedberg as Lemony Whip-It, Ellen Cormier as Anne of Mean Gables, Claire Evans as Malice in Wonderland, and Jason Henry as Skippyjon Bones.

The Philomel and Putnam editorial and design departments (top l. to r.: Amalia Frick, Katherine Perkins, Dave Kopka; bottom l. to r.: Talia Benamy, Jenny Chung, Liz Lunn) took Judith St. George’s So You Want to Be President to heart and dressed up in their patriotic finest as Washington, Jefferson, Lincoln, FDR, Eisenhower, and Teddy Roosevelt.

(From l.): Grosset & Dunlap’s Laura Stiers, Tabitha Dulla, Betsy Peterschmidt, Kayla Wasil, Sara Schonfeld, and Christina Dacanay, as the cast of Clue, visited the Puffin’s “Penguin Prom” photo booth.

At Simon & Schuster, Jon Anderson (l.) and Richard Ackoon dressed as the penguins from And Tango Makes Three.

S&S Children’s subsidiary rights team came as the witches from the Poppy Pendle series.

Neil Swaab (l.) as the Sasquatch father and Russell Gordon (r.) as the teen boy adopted by the family of Sasquatches from The Shadows We Know by Heart. Swaab illustrated the book’s cover.

Party-goers at Phoenix International Kids: (from l.) Pam Seatter, Laura Whitaker, Emily Skwish, Chester Hundrieser, Ashley Hicks, Rachel Halpern, Denise Ethridge, and Dana Blaesing.

Highlights Press staffers Brittany Ryan (Belle from Beauty and the Beast), Michelle Budzilowicz (Fancy Nancy/Nancy Drew) and Allison Kane (Amelia Bedelia).

More costumes at Highlights: Michelle Budzilowicz (Fancy Nancy/Nancy Drew), Paul Nalesnik (bubble wrap guy) and Marlo Scrimizzi (biker chick).

Hannah Moushabeck as the forthcoming Chronicle Books Ice Cream Cone Puzzle, and Camille Geeter as a senior gambler.

Kristen Hewitt offers chips and snacks while Madeline Moe and Janine Seto pay homage to the TV show Reno 911.

“Are we not men....”: Quarto staffers in Minneapolis dressed as the band Devo, for a Music from 1976 theme.

Marvel characters from 1976 invaded Quarto’s California office.

Albert Whitman & Company staffers display their thematic costumes.

Albert Whitman’s pumpkin bowling champion/business director, Joe Campbell.