Enter Your Programs into the 2024 National Día Program Registry! El día de los niños/El día de los libros (Children's Day/Book Day), commonly known as Día, is a celebration every day of children, families, and reading that culminates yearly on April 30. Día is a nationally recognized initiative that emphasizes the importance of literacy for all children of all linguistic and cultural backgrounds. It is a daily commitment to linking children and their families to diverse books, languages, and cultures.