BBC: Authors, artists and musicians are due to gather at a library in San Francisco to protest against the banning of books in schools and libraries in the US.
The event, part of the 27th annual Banned Books Week, has been organised by the American Library Association.
Since 2001 bans on 3,736 books and other materials have been requested.
In recent years, And Tango Makes Three - based on a true story and centring on gay penguins in New York's Central Park Zoo - has had the most ban requests.
The book's authors are Justin Richardson and Peter Parnell.
In a statement to the BBC on Friday, Mr Richardson said: "It's regrettable that some parents believe reading a true story about two male penguins hatching an egg will damage their children's moral development.
"They are entitled to express their beliefs, but not to inflict them on others."
Reasons given by organisations and individuals for their requests to get it removed from public shelves, include "anti-ethnic, anti-family, homosexuality, religious viewpoint, and unsuited to age group".
Other works featuring in the most-challenged books list for 2008 include Philip Pullman's His Dark Materials and Khaled Hosseini's The Kite Runner. Parents' concern >>> | Thursday, October 01, 2009
