Question: This Canadian actor won a Best Picture award for the film River's Edge with which award ceremony?

full_context: Document 1: Kevin Costner: Kevin Michael Costner (born January 18, 1955) is an American actor, director, producer, and musician. His accolades include two Academy Awards, three Golden Globe Awards, and one Emmy Award.
Document 2: Kelly Fremon Craig: Kelly Fremon Craig is an American screenwriter, producer, and film director. She is known for directing, writing, and co-producing the 2016 coming-of-age comedy-drama "The Edge of Seventeen."
Document 3: Frozen River: Frozen River is a 2008 American crime drama film written and directed by Courtney Hunt. The screenplay focuses on two working-class women who smuggle illegal immigrants from Canada to the United States. It received two Academy Award nominations: Best Actress (Melissa Leo) and Best Original Screenplay (Courtney Hunt).
Document 4: Johnny Mnemonic (film): Johnny Mnemonic is a 1995 Canadian-American cyberpunk action thriller film directed by Robert Longo in his directorial debut. The film stars Keanu Reeves and Dolph Lundgren. The film is based on the story of the same name by William Gibson. Keanu Reeves plays the title character, a man with a cybernetic brain implant designed to store information. The film portrays Gibson's dystopian view of the future with the world dominated by megacorporations and with strong East Asian influences. This was Dolph Lundgren's last theatrically released film until 2010's "The Expendables".
Document 5: The Edge of Seventeen: The Edge of Seventeen is a 2016 American coming-of-age comedy-drama film written and directed by Kelly Fremon Craig. The film stars Hailee Steinfeld, Woody Harrelson, Kyra Sedgwick, and Haley Lu Richardson. Principal photography began on October 21, 2015, in Vancouver and ended on December 3, 2015.
Document 6: My Own Private River: My Own Private River is a re-contextualized adventure drama film of My Own Private Idaho (1991). Using footage shot and directed by Gus Van Sant in 1990, the new edit gives James Franco and Van Sant a shared director credit. The project is in tribute to Franco's favorite actor, River Phoenix. Franco called "Idaho" one of his favorite movies and praised River's performance as the actor’s best.
Document 7: Charles Braverman: Charles "Chuck" Dell Braverman (born March 3, 1944 in Los Angeles, California) is an American film director, documentary filmmaker and producer. He was nominated for an Academy Award for Documentary Short Subject for his 2000 documentary, "Curtain Call"; he was also nominated for three Directors Guild of America Awards for Outstanding Directorial Achievement in Documentary (2000, 2001, 2002), winning in 2000 for "High School Boot Camp". He has also directed episodes of several major television series, including "Beverly Hills, 90210", "Melrose Place" and "Northern Exposure" as well as television films such as the "Prince of Bel Air" and "Brotherhood of Justice" starring Keanu Reeves and Kiefer Sutherland.
Document 8: Keanu (film): Keanu is a 2016 American action comedy film directed by Peter Atencio and written by Jordan Peele and Alex Rubens. The film stars Peele, Keegan-Michael Key, Method Man, Nia Long, and Will Forte. Filming began in New Orleans, Louisiana in June 2015. The film premiered at the South by Southwest Festival on March 13, 2016, and was released theatrically in North America on April 29, 2016, receiving generally positive reviews from critics and grossed $20 million against its $15 million budget.
Document 9: The River (1984 film): The River is a 1984 American drama film directed by Mark Rydell, written by Robert Dillon and Julian Barry, and stars Mel Gibson, Sissy Spacek, and Scott Glenn. The film tells the story of a struggling farm family in the Tennessee valley trying to keep its farm from going under in the face of bank foreclosures and floods. The father faces the dilemma of having to work as a strikebreaker in a steel mill to keep his family farm from foreclosure. It was based on the true story of farmers who unknowingly took jobs as strikebreakers at a steel mill after their crops had been destroyed by rain.
Document 10: Man of Tai Chi: Man of Tai Chi is a 2013 Chinese-American martial arts film directed by and starring Keanu Reeves in his directorial debut, and co-stars Tiger Chen, Iko Uwais, Karen Mok and Simon Yam. "Man of Tai Chi" is a multilingual narrative, partly inspired by the life of Reeves' friend, stuntman Tiger Chen.
Document 11: River's Edge: River's Edge is a 1987 American drama film directed by Tim Hunter, written by Neal Jimenez, and starring Crispin Glover, Keanu Reeves, Ione Skye Leitch, Daniel Roebuck, and Dennis Hopper. It was awarded Best Picture at the 1986 Independent Spirit Awards.
Document 12: The River Wild: The River Wild is a 1994 American adventure crime-thriller film directed by Curtis Hanson and starring Meryl Streep, Kevin Bacon, David Strathairn, John C. Reilly, Benjamin Bratt, and Joseph Mazzello as Roarke. The film is about a family on a whitewater rafting trip who encounter two violent criminals in the wilderness.
Document 13: Keanu Reeves: Keanu Charles Reeves ( ; born September 2, 1964) is a Canadian actor, director, producer, and musician.
Document 14: Jackie Chan: Chan Kong-sang, SBS, MBE, PMW, (陳港生 ; born 7 April 1954), known professionally as Jackie Chan, is a Hong Kong martial artist, actor, film director, producer, stuntman, and singer. In his movies, he is known for his acrobatic fighting style, comic timing, use of improvised weapons, and innovative stunts, which he typically performs himself. He has trained in Kung Fu and Hapkido. He has been acting since the 1960s and has appeared in over 150 films.
Document 15: The River Why (film): The River Why is a 2010 American independent drama film directed by Matthew Leutwyler. It is an adaptation of the 1983 Sierra Club novel of the same name by David James Duncan and stars Zach Gilford, William Hurt and Amber Heard. Showtime broadcast the film in August 2011 and was later screened in the United States as benefit for fish and river conservation groups. The film was released on Blu-ray and DVD on November 8, 2011. The film won the award for Best Cinematography at the Ashland Film Festival and the Audience Award for Best film at The Naples International Film Festival.
ground_truth: 1986 Independent Spirit Awards