The Celebration (1998) is a Danish drama film directed by Thomas Vinterberg. It tells the story of a family gathering to celebrate the 60th birthday of their patriarch, Helge. As the family members arrive, old tensions and secrets begin to surface, leading to a dramatic climax.
From Wikipedia
The Celebration is a 1998 Danish black comedy-drama film directed by Thomas Vinterberg and produced by Nimbus Film. It tells the story of a family gathering to celebrate their patriarch's 60th birthday, during which a family secret is revealed.