The event has been sparking imaginations and instilling a love of reading for decades, with children and adults alike dressing up in honour of their favourite books.
See if you made our gallery below…
17. Jessica- Hermione Grainger
'It's wingardium leviosa, not wingardium levio-sar!' Jessica is casting a spell as Hermione and celebrates her seventh birthday today, too. Photo: Kelly Robinson
18. Ruari- Sonic
Ruari, 4, makes a great Sonic. He attends Woodseats Primary School. Photo: Alice Thomas
19. Madison- Mary Poppins
Six-year-old Madison, who attends Valley Park School, makes a supercalifragilisticexpialidocious Mary Poppins. Photo: Richard Wild
20. Hope- Bob the Builder
Can she fix it? Yes she can! Five-year-old Hope, who attends Woolley Wood Special School, looks great in her Bob the Builder costume. Photo: Gemma Finn