Question: Which upcoming winter Olympic event will contest mixed doubles for the first time?

Context paragraphs:
Ross Powers: Ross Powers (born February 10, 1979) is an American world champion halfpipe snowboarder from South Londonderry, Vermont.  Though he originally rode at Stratton Mountain, Vermont, his home mountain is now Okemo, VT.  Ross helps with the design of the Superpipe and also helped design the RossCross Family Terrain Park.  Ross also runs a snowboard camp through Okemo.  He led the U.S. sweep in the 2002 Winter Olympics men's halfpipe competition, one day after his 23rd birthday.  This is the first time the Americans have swept a Winter Olympic event since the men's figure skaters did in 1956.  Powers, with a score of 46.1, dominated the competition.

List of Olympic medalists in luge: Luge is one of the seven Olympic sports currently contested at the Winter Olympic Games.  It has been a constant presence in the Olympic program since its introduction at the 1964 Winter Olympics in Innsbruck, Austria, in the form of three events: men's singles, women's singles, and doubles.  A mixed team relay event was contested for the first time at the 2014 Winter Olympics in Sochi.

List of Olympic medalists in snowboarding: Snowboarding is a sport that has been contested at the Winter Olympic Games since the 1998 Winter Olympics in Nagano, Japan.  Snowboarding was one of five new sports or disciplines added to the Winter Olympic programme between 1992 and 2002, and was the only one not to have been a previous medal or demonstration event.  In 1998, four events, two for men and two for women, were held in two specialities: the giant slalom, a downhill event similar to giant slalom skiing; and the half-pipe, in which competitors perform tricks while going from one side of a semi-circular ditch to the other.  Canadian Ross Rebagliati won the men's giant slalom and became the first athlete to win a gold medal in snowboarding.  Rebagliati was briefly stripped of his medal by the International Olympic Committee (IOC) after testing positive for marijuana.  However, the IOC's decision was reverted following an appeal from the Canadian Olympic Association.  For the 2002 Winter Olympics, the giant slalom was dropped in favour of the parallel giant slalom, an event that involves head-to-head racing.  In 2006, a third event, the snowboard cross, was held for the first time.  In this event, competitors race against each other down a course with jumps, beams and other obstacles.

Eddie Eagan: Edward Patrick Francis Eagan (April 26, 1897 – June 14, 1967) was an American sportsman who is notable as being the only person to win a gold medal at both the Summer and Winter Olympic Games in different events.  Gillis Grafström won gold in both the Summer and Winter Olympic Games but it was in the same event.  That is because in 1920, prior to the Winter Olympics, figure skating was part of the Summer Olympics.  Eagan won his summer gold in boxing and his winter gold in four-man bobsled.  Finally, Eagan is one of the few athletes who have competed in both the Summer and Winter Olympic games.

Curling at the 2018 Winter Olympics: The curling competition at the 2018 Winter Olympics will be held at the Gangneung Curling Centre.  This will be the seventh time that curling is on the Olympic program.  In each of the men's and women's competitions, ten nations will compete.  For the first time mixed doubles curling will be contested, after being added to the Olympic program in 2015.

2017 Canadian Olympic Curling Trials: The 2017 Canadian Olympic Curling Trials will be held from December 2 to 10 at the Canadian Tire Centre in Ottawa, Ontario.  The event is also known and advertised as the Tim Hortons Roar of the Rings.  The winners of the men's and women's events were chosen to represent Canada at the 2018 Winter Olympics.

Summer Olympic Games: The Summer Olympic Games (French: "Jeux olympiques d'été" ) or the Games of the Olympiad, first held in 1896, is an international multi-sport event that is hosted by a different city every four years.  The most recent Olympics were held in Rio de Janeiro, Brazil.  The International Olympic Committee organizes the games and oversees the host city's preparations.  In each Olympic event, gold medals are awarded for first place, silver medals are awarded for second place, and bronze medals are awarded for third; this tradition began in 1904.  The Winter Olympic Games were created due to the success of the Summer Olympics.

Alida Chen: Alida Chen (born 6 January 1993) is a Dutch female badminton player.  She won the 2009 Netherlands national championships U13 in girls' singles, doubles and mixed doubles, 2011 U15 in girls' singles, doubles and mixed doubles, 2012 U17 in girls' singles, doubles and mixed doubles, and 2013 U17 in mixed doubles.  She became a quarter finalist at the 2014 Youth Olympic Games in mixed doubles event.

Snowboarding at the Winter Olympics: Snowboarding is a sport at the Winter Olympic Games.  It was first included in the 1998 Winter Olympics in Nagano, Japan.  Snowboarding was one of five new sports or disciplines added to the Winter Olympic program between 1992 and 2002, and was the only one not to have been a previous medal or demonstration event.  In 1998, four events, two for men and two for women, were held in two specialities: the giant slalom, a downhill event similar to giant slalom skiing; and the half-pipe, in which competitors perform tricks while going from one side of a semi-circular ditch to the other.  Canadian Ross Rebagliati won the men's giant slalom and became the first athlete to win a gold medal in snowboarding.  Rebagliati was briefly stripped of his medal by the International Olympic Committee (IOC) after testing positive for marijuana.  However, the IOC's decision was reverted following an appeal from the Canadian Olympic Association.  For the 2002 Winter Olympics, giant slalom was expanded to add head-to-head racing and was renamed parallel giant slalom.  In 2006, a third event, the snowboard cross, was held for the first time.  In this event, competitors race against each other down a course with jumps, beams and other obstacles.  On July 11, 2011, the International Olympic Committee's Executive Board approved the addition of Ski and Snowboard Slopestyle to the Winter Olympics roster of events, effective in 2014.  The decision was announced via press conference from the IOC's meeting in Durban, South Africa.  A fifth event, parallel slalom, was added be in 2014.

Léa Palermo: Léa Palermo (born 7 July 1994) is a French female badminton player.  She started playing badminton at aged 8, then joined the France national badminton team in 2006.  In 2009, she won bronze medal at the European U17 Badminton Championships in mixed doubles event.  In 2010, she competed at the Summer Youth Olympic Games in Singapore.  In 2015, she won the Slovenia International tournament in the mixed doubles event partnered with Bastian Kersaudy.  In 2016, she won French National Badminton Championships in women's doubles event.  She also the runner-up at the Orleans International in the women's doubles event and at the Estonian International in the mixed doubles event.  In 2017, she became the runner-up at the Estonian International partnered with Delphine Delrue.

Supporting paragraphs: 2017 Canadian Olympic Curling Trials Curling at the 2018 Winter Olympics
Answer: For the first time mixed doubles curling will be contested, after being added to the Olympic program in 2015.