<Tr> <Th> Frequency </Th> <Td> annual </Td> </Tr> <P> World Book Day or World Book and Copyright Day (also known as International Day of the Book or World Book Days) is a yearly event on April 23rd, organized by the United Nations Educational, Scientific and Cultural Organization (UNESCO), to promote reading, publishing and copyright . In the United Kingdom, the day is recognized on the first Thursday in March . World Book Day was celebrated for the first time on 23 April 1995 . </P> <P> The connection between 23 April and books was first made in 1923 by booksellers in Catalonia, Spain The original idea was of the Valencian writer Vicente Clavel Andrés as a way to honour the author Miguel de Cervantes, first on October 7, his birth date, then on April 23, his death date . In 1995 UNESCO decided that the World Book and Copyright Day would be celebrated on 23 April, as the date is also the anniversary of the death of William Shakespeare and Inca Garcilaso de la Vega, as well as that of the birth or death of several other prominent authors . (In a historical coincidence, Shakespeare and Cervantes died on the same date--23 April 1616--but not on the same day, as at the time, Spain used the Gregorian calendar and England used the Julian calendar; Cervantes actually died 10 days before Shakespeare died .) </P> <Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (April 2014) (Learn how and when to remove this template message) </Td> </Tr> </Table>

Who's birthday is celebrated as children's day