The connection between 23 April and books was first made in 1923 by booksellers in Catalonia as a way to honour the author Miguel de Cervantes, who died on this 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 Garcilaso de la Vega, as well as that of the birth or death of several other prominent authors.
To celebrate this day, Cervantes's Don Quixote is read during a two-day "readathon" and the Miguel de Cervantes Prize is presented by the Spanish king in Alcalá de Henares.
In Catalonia, Spain, St. George's Day has been 'The Day of the Rose' since 1436, and involves the exchange of gifts between loved ones and respected people—it is analogous to Valentine's Day. Although World Book and Copyright Day has been celebrated since 1995 internationally, books were exchanged on 'The Day of the Rose' in Catalonia since at least 1926, in memory of Cervantes.
In the UK, World Book Day is held annually on the first Thursday in March, as 23 April clashes with Easter school holidays; 23 April is also the National Saint's Day of England, St George's Day. Conversely, a separate event World Book Night organized by independent charity The Reading Agency is held on 23 April.