Question: What event happens during the 2016 movie that is directed by Yeon Sang-ho and stars Gong Yoo?

Context paragraphs:
Ricochet Gathering: Ricochet Gathering is a unique collaboration event for electronic music.  This name applies to the event and also the group of musicians involved in the event, where a group of musicians and a usually small group fans gather at unique locations throughout the world.  The event happens approximately once each calendar year.  The first gathering occurred at the Okefenokee Swamp in April 2000.  Each gathering event has a theme tied to the Berlin School of electronic music pioneers Tangerine Dream.

The King of Pigs: The King of Pigs () is a 2011 South Korean animated drama film based on a true story, directed by Yeon Sang-ho.  It won three awards at the 2011 Busan International Film Festival.  The film was selected to be screened in the Directors' Fortnight section at the 2012 Cannes Film Festival.  One primary trait of the film is that its events are based on actual accounts, accurately depicted down to every last detail.

Psychokinesis (film): Psychokinesis is an upcoming South Korean black comedy film directed by Yeon Sang-ho.  The film stars Ryu Seung-ryong, Shim Eun-kyung, Park Jung-min, Kim Min-jae and Jung Yu-mi.

Gong Yoo: Gong Ji-chul (; born July 10, 1979), better known by his stage name Gong Yoo (), is a South Korean actor.  He is best known for his roles in television dramas "The 1st Shop of Coffee Prince" (2007) and "" (2016-2017), and the films "Silenced" (2011), "The Age of Shadows" (2016), and "Train to Busan" (2016).

Animation Masters Summit: The Animation Masters Summit (AMS) is an animation industry conference organized every year by Toonz Animation India.  The event brings together animation experts from across the world to discuss latest trends in animation industry.  The event venue is in Trivandrum , the capital city of Kerala in India.  The speakers, known as ' masters' of the event share their expertise and experiences with passionate animation professionals and aspiring young talent.  The event happens during April/May every year, from 1999.  The event is a cross-section of mastery in Animation, visual effects and Media industry.

Almost surely: In probability theory, one says that an event happens almost surely (sometimes abbreviated as a.s.) if it happens with probability one.  In other words, the set of possible exceptions may be non-empty, but it has probability zero.  The concept is precisely the same as the concept of "almost everywhere" in measure theory.  In probability experiments on a finite sample space there is no difference between "almost surely" and "surely", but the distinction becomes important when the sample space is an infinite set (because an infinite set can have non-empty subsets of probability zero).  Some examples of the use of this concept include the strong and uniform versions of the law of large numbers, and the continuity of the paths of Brownian motion.

The Fake (2013 film): The Fake () is a 2013 South Korean animated film written and directed by Yeon Sang-ho.

Train to Busan: Train to Busan () is a 2016 South Korean zombie apocalypse action thriller film directed by Yeon Sang-ho and starring Gong Yoo, Jung Yu-mi, and Ma Dong-seok.  The film takes place on a train to Busan, as a zombie apocalypse suddenly breaks in the country and compromises the safety of the passengers.

Seoul Station (film): Seoul Station (Korean: 서울역 ) is a South Korean animated zombie drama film written and directed by Yeon Sang-ho.  Released on August 18, 2016, the film stars Ryu Seung-ryong, Shim Eun-kyung and Lee Joon in the lead roles.  The film was shown at the 2016 Edinburgh International Film Festival.

Yeon Sang-ho: Yeon Sang-ho (born 1978) is a South Korean film director and screenwriter.  He wrote and directed the animated films "The King of Pigs" (2011) and "The Fake" (2013), and the live-action film "Train to Busan" (2016).

Supporting paragraphs: Yeon Sang-ho Train to Busan
Answer: zombie apocalypse