Here are a few pictures of World Book Day in Calderdale over the years - can you spot anyone you know?
5. World Book Day
Walsden Junior School celebrates World Book Day in 2006 Photo: National World
6. World Book Day
Pupils and staff are pictured at the World Book Day at Holy Trinity school, Halifax back in 2006 Photo: Ian Swift
7. World Book Day
Pupils at St Joseph's School, Todmorden dressed up for World Book Day back in 2005 Photo: National World
8. World Book Day
West Vale Primary School, Stainland Road, Greetland World Book Day back in 2013 Photo: Charles Round