Question:  The 2011 WPA World Nine-ball Championship was organized by a sport event promotions company based in which city ?

full_context: Document 1: 2011 WPA World Nine-ball Championship: The 2011 WPA World Nine-ball Championship (a.k.a. the World Pool Championship 2011) was the professional nine-ball pocket billiards (pool) championship, sanctioned by the World Pool-Billiard Association (WPA) and organised by Matchroom Sport. It was held from 25 June through 1 July in Doha, Qatar, hosted by the Qatar Billiards and Snooker Federation. Qualifying tournaments were held from 21 to 23 June, with the Al Sadd Sports Club hosting both qualifying and final tournaments.
Document 2: Bet365: Bet365 Group Ltd (styled as "bet365") is a gambling company based in the United Kingdom. Bet365 is one of the world's leading online gambling groups with over 19 million customers in almost two hundred countries. The Group employs over 3,000 people and is the largest private employer in the city of Stoke-on-Trent.
Document 3: ONE Championship: ONE Championship (formerly known as ONE Fighting Championship or ONE FC) is a Singapore-based mixed martial arts (MMA) promotion which was launched on 14 July 2011 by multimillionaire entrepreneur Chatri Sityodtong and former ESPN Star Sports senior executive Victor Cui. According to CNBC, ONE Championship is Asia's largest sports media property with a global broadcast to over one billion homes in 128 countries.
Document 4: 2007 WPA Men's World Nine-ball Championship: The 2007 WPA Men's World Nine-ball Championship (billed in the host country as 2007 Philippines World Pool Championship) was the 18th annual international nine-ball pool tournament for men sanctioned by the World Pool-Billiard Association (WPA). It was held at the Araneta Coliseum in Quezon City, Metro Manila, Philippines from 3–11 November 2007. It was the second consecutive time the tournament has been held in the Philippines.
Document 5: Arena Birmingham: Arena Birmingham (previously known as The Barclaycard Arena and the National Indoor Arena) is an indoor sporting and entertainment venue in Birmingham, United Kingdom. The Arena, which is owned by parent company, the NEC Group, is situated in central Birmingham. When it was opened in 1991, it was the largest indoor arena in the UK.
Document 6: 2011 WSA World Series: The WSA World Series 2011 is a series of women's squash tournaments which are part of the Women's Squash Association (WSA) World Tour for the 2011 squash season. The WSA World Series tournaments are some of the most prestigious events on the women's tour. The best-performing players in the World Series events qualify for the annual 2011 WSA World Series Finals tournament. Nicol David won her first WSA World Series Squash Finals trophy, beating Madeline Perry in the final.
Document 7: The Contender Challenge: UK vs. USA: The Contender Challenge: UK vs. USA was a series of boxing matches on 30 March 2007, held at Metro Radio Arena, Newcastle, England, featuring 6 boxers from the US reality television shows "The Contender" and "The Contender 2". The Contenders, in a team coached by Sugar Ray Leonard, took on 6 boxers from the UK, all promoted by Frank Warren, and coached by Barry McGuigan. The winning team was awarded the "Sugar Ray Leonard Cup," not unlike the Ryder Cup in Golf
Document 8: Snooker season 2011/2012: The 2011/2012 snooker season was a series of snooker tournaments played between 1 June 2011 and 7 May 2012. The Brazil Masters became the first professional event held in South America, and the Australian Goldfields Open the first ranking event in Australia. The World Cup was held again after 1996. At the end of the season Ronnie O'Sullivan was named the "World Snooker Player of the Year" and the "Snooker Writers Player of the Year", Judd Trump the "Fans Player of the Year" and Luca Brecel the "Rookie of the Year". Stuart Bingham received the "Performance of the Year" for winning his first ranking event, the Australian Goldfields Open. Stephen Hendry's maximum break at the World Championship received "The Magic Moment" award. Walter Donaldson, Mark Williams, John Higgins and Ronnie O'Sullivan were inducted into the Hall of Fame.
Document 9: Matchroom Sport: Matchroom Sport is a sport event promotions company led by the founder and owner English entrepreneur Barry Hearn and his son Eddie. It first came to attention in the sports of snooker and boxing and is also involved in pool, bowling, golf (see PGA EuroPro Tour), fishing, darts, ping pong, and poker and as of late 2016 gymnastics. The company is based in Brentwood, Essex.
Document 10: World Straight Pool Championship: The World Straight Pool Championship, or the World 14.1 Tournament if no world championship is on the line, is a pocket billiards (pool) competition, that has been held annually in New Brunswick, New Jersey, since 2006. Between the years of 1941 and 1957, Willie Mosconi won the World Straight Pool Championship an unmatched fifteen times. In 1933, Mosconi competed in the Billiard Congress of America (BCA) World Straight Pool Championship. He nearly won the title but lost in the final to Erwin Rudolph It is the current global professional title for straight pool (also known as 14.1 continuous), and is organized by Dragon Promotions, in part to restore the game's popularity in the United States. Though billed as a world championship, the tournament in some years (including 2009, 2011 and 2012) has not been sanctioned by, or recognized as a world title event by the World Pool-Billiard Association (WPA) . The WPA in turn has not recognized any of the World 14.1 winners from 1912 onwards even through the golden era of Willie Mosconi, Steve Mizerak, Luther Lassiter, Ralph Greenleaf and numerous other legendary players. Although the World 14.1 and all its champions are vastly recognized by the media, fans, pool historians, and professional players themselves. The 2006, 2007, 2008, 2010 event were WPA-recognized. The 2013 & 2014 event was sanctioned by the ABP Association of Billiard Professionals founded by multi-world champion Johnny Archer.
Document 11: 2010 WPA World Nine-ball Championship: The 2010 WPA World Nine-ball Championship (a.k.a. the World Pool Championship 2010) was the professional nine-ball pocket billiards (pool) championship, sanctioned by the World Pool-Billiard Association (WPA) and organised by Matchroom Sport. It was held from 29 June through 5 July in Doha, Qatar, hosted by the Qatar Billiards and Snooker Federation. Qualifying tournaments were held from 25 through 29 June in the same city.
Document 12: Marcus Evans: Marcus Paul Bruce Evans (born 18 August 1963) is an English businessman who is also the owner and chairman of Ipswich Town Football Club. He is originally from Walsham-le-Willows, near Bury St Edmunds in Suffolk, but grew up near Wimbledon, London. He founded his company marcus evans in 1983. The group organises live business, sports and entertainment events around the world. Its global regional head offices are: Europe – Dublin, US – Chicago and APAC – Kuala Lumpur.
Document 13: WPA World Nine-ball Championship: The WPA World Nine-ball Championship is an annual, international, professional nine-ball pool (pocket billiards) tournament, founded in 1990, sanctioned by the World Pool-Billiard Association (WPA), and principally sponsored and organised by Matchroom Sport (who provide the event's official website, under the less specific name World Pool Championship). It is divided into men's, women's and wheelchair Divisions. Since 2010, it is held in Doha, Qatar.
Document 14: Jon J. Franklin: Jon J Franklin (aka "Jon Franklin") is a sports marketing and sports television business executive who is currently Chief Executive Officer of Glory Sports International, the parent company of Glory Kickboxing seen on ESPN TV and CBS in the USA along with UFC Fightpass (in a major deal announced in 2016) and on major networks including Eurosport, Ziggo Sports Holland, Le TV China and others in more than 170 countries. Since Franklin joined Glory as CEO in 2014, Glory Kickboxing has undergone a complete strategic remake and seen solid advances in ratings, attendance and following culminating in John Malone's Liberty Global and Yao Ming's Yao Capital joining Glory as investors and partners. In the final months of 2016, Glory produced events in Trenton, New Jersey, Denver, Colorado, Nice, France and on December 10, a sold out major global PPV event in conjunction with the UFC, Collision, Rico v Badr, the fight no one thought could be made, in Oberhausen, Germany. Further Glory events for 2017 have included Glory LA Live, January 20 and a sold out show at Sears Center Chicago, February 24th. In Europe Brussels Belgium hosted Glory on March 25th, Copenhagen in April, Holland in May, Paris in June and a sold out show from New York, Madison Square Garden Theatre on July 14, 2017. Franklin has stated his intent to bring Glory to Toronto Canada, to San Paulo, Brazil and also to China in 2017 and 2018.
Document 15: 2011 PSA World Series: The PSA World Series 2011 is a series of men's squash tournaments which are part of the Professional Squash Association (PSA) World Tour for the 2011 squash season. The PSA World Series tournaments are some of the most prestigious events on the men's tour. The best-performing players in the World Series events qualify for the annual 2011 PSA World Series Finals tournament. Amr Shabana won his first PSA World Series Squash Finals trophy, beating Grégory Gaultier in the final.
ground_truth: Brentwood, Essex