Question: Which 2017 festival did a Barry Keoghan movie directed by Yorgos Lanthimos was selected to compete in the main competition?

Context paragraphs:
The Lobster: The Lobster is a 2015 absurdist dystopian black comedy film directed, co-written, and co-produced by Yorgos Lanthimos, co-produced by Ceci Dempsy, Ed Guiney, and Lee Magiday, and co-written by Efthimis Filippou.  In the film's setting, single people are given 45 days to find a romantic partner or otherwise be turned into animals.  It stars Colin Farrell as a newly-single man trying to find someone so he can remain human, and Rachel Weisz as a woman with whom he attempts to form a relationship.  The film is co-produced by Ireland, United Kingdom, Greece, France and the Netherlands.

Kinetta (film): Kinetta (Greek: Κινέτα ) is a 2005 Greek drama film directed by Yorgos Lanthimos.  It was written by Yorgos Lanthimos and Yorgos Kakanakis.  Aris Servetalis, Evangelia Randou and Costas Xikominos are the main protagonists.

Alps (film): Alps (, translit.  "Alpeis") is a 2011 Greek drama film directed by Yorgos Lanthimos.  It stars Aggeliki Papoulia and Ariane Labed, and was co-written by Lanthimos and Efthymis Filippou.  It premiered in competition at the 68th Venice International Film Festival where it won Osella for Best Screenplay.  It also won the Official Competition Prize for New Directions in Cinema at the Sydney Film Festival in 2012.

The Killing of a Sacred Deer: The Killing of a Sacred Deer is a 2017 psychological horror-thriller film directed by Yorgos Lanthimos, from a screenplay by Lanthimos and Efthymis Filippou.  It stars Colin Farrell and Nicole Kidman.  It was selected to compete for the Palme d'Or in the main competition section at the 2017 Cannes Film Festival.  At Cannes, Lanthimos and Filippou won the Best Screenplay award.  The film is scheduled to be released in the United States on October 20, 2017, by A24, before being released in the United Kingdom on November 17, 2017, by Curzon Artificial Eye.

Barry Keoghan: Barry Keoghan (born 18 October 1992) is an Irish actor.  He has appeared in the films "Dunkirk" along with Mark Rylance, Tom Hardy, Cillian Murphy, Kenneth Branagh, Tom Glynn-Carney; "The Killing of a Sacred Deer" with Nicole Kidman, Colin Farrell and Alicia Silverstone; and "Trespass Against Us" with Michael Fassbender and Brendan Gleeson.  He has also played the "heartless cat killer" Wayne in the RTÉ drama "Love/Hate".

My Best Friend (2001 film): My Best Friend (Greek: Ο καλύτερος μου φίλος ) is a 2001 Greek comedy film directed by Yorgos Lanthimos and Lakis Lazopoulos.

The Favourite (film): The Favourite is an upcoming British-Irish-American biographical historical film directed by Yorgos Lanthimos, from a screenplay by Deborah Davis and Tony McNamara.  It stars Emma Stone, Olivia Colman, Rachel Weisz, Nicholas Hoult and Joe Alwyn.

Efthymis Filippou: Efthymis "Efthimis" Filippou (] ; born 18 January 1977) is a Greek screenwriter, known for his collaborations with Yorgos Lanthimos.  He was the winner of the Golden Osella Award for Best Screenplay at the 68th Venice International Film Festival in 2011, which he shared with Yorgos Lanthimos.  In 2016, he was invited from the Academy of Motion Picture Arts and Sciences to become a member.

Toronto Design Offsite Festival: The 7th annual Toronto Design Offsite Festival (TO DO) is the city of Toronto's not-for-profit design week showcasing Canadian designers, held in Toronto, Ontario, Canada, January 16 to the 22, 2017.  The 2017 festival will feature over 100 exhibitions and events taking place across the city.  Over 80% of the events in the festival are free and all are open to the public.  Events in the 2017 Festival include the TO DO Festival Party, Outside the Box exhibition, Living Well exhibition, TO DO Talks Symposium, Come Up To My Room exhibition and the consumer fair the Interior Design Show.

Dogtooth (film): Dogtooth (Greek: Κυνόδοντας , translit.  "Kynodontas") is a 2009 Greek film directed by Yorgos Lanthimos about a husband and wife who keep their children ignorant of the world outside their property well into adulthood.  The film stars Christos Stergioglou, Michelle Valley, Angeliki Papoulia, Mary Tsoni, and Christos Passalis.

Supporting paragraphs: Barry Keoghan The Killing of a Sacred Deer
Answer: Cannes Film Festival