Question: X Games XV It took place at a multi-purpose sports arena that opened on what date?

Context paragraphs:
Keri Herman: Keri Herman (born August 16, 1982) is an American freestyle skier.  She won a silver medal in "Slopestyle" at the 2011 Winter X Games XV in Aspen, Colorado, behind Kaya Turski.  The following week, Herman took bronze at the 2011 FIS Freestyle World Ski Championships.  Herman now holds a total of 4 Winter X Games medals.  2 in Aspen and 2 from European X Games in Tignes, France.  Keri Herman grew up in Bloomington, MN.  She played ice hockey during her four years at Visitation High School as Center for the Visitation Blazers team.  She moved to CO to attend the University of Denver where she graduated in 2005 with a BSBA in Finance and Marketing.  She studied abroad for a semester at the University of Queensland, Australia.  She moved to Breckenridge in 2004 where she has since lived, traveling around the world competing in Slopestyle and Halfpipe skiing events.  In 2011, she was named to the first US Freeskiing Slopestyle team.  Her sponsors are ROCKSTAR Energy, Scott USA, Breckenridge Resort, HEAD SKIS, US Freeskiing, Buff, Jiberish, and Discrete.

Mika Sports Arena: Officially the State Revenue Committee Under the Government of the Republic of Armenia Sports Hall (Armenian: Հայաստանի Հանրապետության Կառավարության Առընթեր Պետական Եկամուտների Կոմիտեի Մարզադահլիճ ), abbreviated as KAPEK Sports Hall (Armenian: ԿԱՊԵԿ Մարզադահլիճ ), and commonly known as Mika Sports Arena (Armenian: Միկա Մարզադահլիճ ), is a multi-purpose sports arena located in the Shengavit District of Yerevan, the capital of Armenia.  It has a capacity of 1,550 spectators.

Staples Center: Staples Center, officially stylized as STAPLES Center, is a multi-purpose sports arena in Downtown Los Angeles.  Adjacent to the L.A. Live development, it is located next to the Los Angeles Convention Center complex along Figueroa Street.  Opening on October 17, 1999, it is one of the major sporting facilities in the Greater Los Angeles Area.

X Games XV: X Games XV was the fifteenth annual X Games extreme sports event.  It took place from July 30 - August 2, 2009, in Los Angeles, California, at the Staples Center and the Home Depot Center.  It was broadcast on ESPN networks, ABC, and EXPN.com.

Winter X Games XV: Winter X Games XV (styled as Winter X Games Fifteen in the official logo) were held from January 26 to January 30, 2011, in Aspen, Colorado.  They are the 10th consecutive Winter X Games to be held in Aspen.  The events were broadcast on ESPN.

X Games XVIII: X Games XVIII (re-titled X Games Los Angeles 2012) was an action sporting event which took place from June 28 – July 1, 2012 in Los Angeles, California.  Venues for the event included the Staples Center, Nokia Theater and the streets near L.A. Live.  The games featured the sports of Moto X, skateboarding, BMX, and RallyCross.  Last year's X Games 17 was the first ever X Games to feature Enduro X, which replaced Super X.  In 2013, the Summer X Games will be held in four international cities in Foz do Iguaçu, Brazil (April 18–21, 2013); Barcelona, Spain (May 9–12, 2013); Munich, Germany (June 27–30, 2013); and Los Angeles, California (August 1–4, 2013).

Sebastien Toutant: Sebastien Toutant (born 9 November 1992) is a Canadian snowboarder, and is occasionally called Seb Toots.  He won a silver medal in "Snowboard Big Air" at the 2011 Winter X Games XV in Aspen, Colorado, behind Torstein Horgmo.  He also won gold in Snowboard Slope Style in the same games.  It was his first gold at the X Games.

Kaya Turski: Kaya Turski (born May 3, 1988) is a Canadian freestyle skier.  She is an eight-time Winter X Games champion in Women's Ski slope style.  At the 2010 Winter X Games XIV held in Aspen, she won her gold medal with the highest ever slopestyle score at a Winter X Games with 96.66.  One week after she won the gold medal in "Slopestyle" at the 2011 Winter X Games XV in Aspen, Colorado, ahead of Keri Herman and Grete Eliassen, she captured the silver medal at the 2011 FIS Freestyle World Ski Championships behind Anna Segal of Australia.  In mid-2013, she tore her anterior cruciate ligament.

Sage Kotsenburg: Sage Kotsenburg (born July 27, 1993) is an American snowboarder.  He won the first-ever Olympic gold medal in men's snowboard slopestyle at the 2014 Winter Olympic Games in Sochi, Russia, and became the first gold medalist at these Olympics.  Kotsenburg won a silver medal in snowboard slopestyle at the 2012 Winter X Games XVI in Aspen, Colorado, behind Mark McMorris.  Kotsenburg won a bronze medal in Snowboard Big Air at the 2011 Winter X Games XV in Aspen, Colorado, behind Torstein Horgmo and Sebastien Toutant.

Grete Eliassen: Grete Eliassen (born September 21, 1986 in Lutsen, Minnesota) is an American-Norwegian freestyle skier.  She won a bronze medal in "Slopestyle" at the 2011 Winter X Games XV in Aspen, Colorado, behind Kaya Turski and Keri Herman.  She has won 6 medals at the Winter X Games in slopestyle and halfpipe events including back to back gold medals in 2005 and 2006.

Supporting paragraphs: X Games XV Staples Center
Answer: 17, 1999