Wikipedia
Festen is a 1998 Danish film, produced by Nimbus Film and directed by Thomas Vinterberg. It was released under the title The Celebration in the United States.
The film tells the story of a family gathering to celebrate their father's 60th birthday. At the dinner, the eldest son publicly accuses his father of sexually abusing both him and his twin sister (who has recently killed herself). Vinterberg was inspired to write it with Mogens Rukov, based on a hoax broadcast by a Danish radio station.
It was the first film created under Dogme 95 rules, a movement of young Danish film makers who preferred simple production values and naturalistic performances. The film was selected as the Danish entry for the Best Foreign Language Film at the 71st Academy Awards, but was not accepted as a nominee.
Festen is a British stage adaptation of the Danish film of the same name (The Celebration being the film's release title in North America). The adaptation is by English playwright David Eldridge. It was first staged in 2004 by producer Marla Rubin at the Almeida Theatre in London, and has since been staged in many countries around the world.