Toni Skivington sent in this photo of Kai, 8, as Wheres Wally, Billie-Rae, 5, as Wheres Wenda and Olivia-Mae, 1, the runaway Tigger.
Here's just a small selection of some of the colourful and imaginative costumes children from across Lancaster and Morecambe were modelling in school today - see next week's Lancaster Guardian for even more.
Verna Houghton sent this photo of Parker, aged four, as Postman Pat.
Leo Verdon, age 4, dressed as Woody.
Rachael Mcilwraith sent us this photo of Jessica, 10 , as the Cat in the Hat, and James, 7, as Thing 3.
Holly Armer sent us a photo of son Louie as one of the Horrible Histories front covers - Slimy Stuarts. He is Guy Fawkes, in a costume handmade by his nanny Janette Keit.
Carl O'Keeffe sent this photo of Phoebe-Leigh, age 9, from Lancaster Steiner School, as the Cat in the Hat.
Lucy Brotheridge sent this picture of Jayden, 10, as Doug The Pug.
Hayley Collingwood sent this photo of Jaxon, 7, as The Joker, and Taylor, 9, as Where's Wally.
Staff at the University of Cumbria pre-school joined in the fun.
Amy Wormwell sent this photo of Leo Taylor, age 5, as Willy Wonka from Charlie and the Chocolate Factory.
Romeo Brown, age six, is dressed as Oliver Twist.
Sinead Beaton sent in this photo of Roman Reign as Elmer.