Question: How many seats in the indoor arena of the Events Center in which UFC 33: Victory is held?

Context paragraphs:
Bren Events Center: The Donald Bren Events Center, commonly known as the Bren Events Center or the Bren, is a 6,000-seat indoor arena on the campus of the University of California, Irvine, in Irvine, California, United States.

Pharr Events Center: Pharr Events Center (presently known as the Boggus Ford Events Center) is a 2,500-seat indoor arena located in Pharr, Texas.  It is used primarily for boxing and wrestling, but is also used as a concert venue, with standing room bringing the capacity to 3,500.  There is parking for 600 cars, plus a 60-by-35-foot performance stage.  It was originally built as a convention center.

Malmö Arena: Malmö Arena is a multi-use indoor arena in Malmö, Sweden, and the home of SHL ice hockey club Malmö Redhawks.  It is the largest arena in the SHL, and the second-largest indoor arena in Sweden.  Apart from hosting Redhawks hockey matches, the arena is often the venue for team handball, floorball, concerts, and other events.  It has also hosted indoor athletics.  Owned and operated by Parkfast AB, the arena was designed by Mats Matson of MM Matsson Konsult AB, Hannu Helkiö of Pöyry Architects, and Gert Wingårdh of Wingårdh arkitektkontor.  Naming rights for the venue are owned by Malmö Stad, in a ten-year contract, agreed in 2007.  Malmö Arena hosted the Eurovision Song Contest 2013 between 14 and 18 May 2013.

Mandalay Bay Events Center: Mandalay Bay Events Center is a 12,000-seat indoor arena at the Mandalay Bay Resort and Casino, on the Las Vegas Strip, in Paradise, Nevada.  It is owned and operated by MGM Resorts International and hosts a number of various music, basketball, boxing and mixed martial arts events.

Leicestershire County Council election, 2009: Elections to Leicestershire County Council took place on 4 June 2009, having been delayed from 7 May, in order to coincide with elections to the European Parliament.  A total of 55 councillors were elected from 52 wards across the county's 7 districts.  The Conservatives held control of the council and increased their majority from 5 seats to 17 seats after gaining many seats from Labour who lost 70% of their seats.  The BNP fielded many more candidates than at the last election which caused their vote share to increase dramatically.

UFC 33: UFC 33: Victory in Vegas was a mixed martial arts event held by the Ultimate Fighting Championship at the Mandalay Bay Events Center in Las Vegas, Nevada on September 28, 2001.  The event was seen live on pay per view in the United States, and later released on home video.

Citizens Business Bank Arena: Citizens Business Bank Arena (originally Ontario Community Events Center) is a multi-purpose arena, in Ontario, California, USA.  It hosts local sporting events and concerts.  Construction officially began on March 7, 2007, and the arena was opened on October 18, 2008.  It is suitable for indoor events, including basketball, ice hockey, ice shows, boxing, graduation ceremonies and concerts.  The arena's basketball capacity is 10,832.  It also seats 9,736 for hockey and its full capacity is 11,089.  The 225000 sqft venue also has 36 luxury suites on two levels.  It is the biggest and most modern arena within the Inland Empire region of California.

Volkswagen Arena Istanbul: Volkswagen Arena Istanbul is a multi-purpose indoor arena that is located in Istanbul, Turkey.  The arena can be used to host live events, such as concerts, fashion shows, award ceremonies, dance and theater shows, basketball games, and other sporting events.  The capacity of the arena ranges from 4,500 to 5,800, depending on different configurations for different events, and a combination of seating, standing, and VIP box configurations.  The arena's capacity for basketball games is 5,240, which includes 5,000 regular seats for fans (88 of which are VIP seats), and 240 available seats in the arena's 24 private lounge suites.

United Kingdom local elections, 1934: Local elections were held in London, city borough councils and in Scotland on 1 November 1934.  The Labour Party gained many seats in sweeping successes throughout the country.  In London they won 457 seats, which gave them control of 11 councils and enabling them to holding four.  In chief provincial boroughs their net gains numbered 276 and gained 6 councils.  There were also Scottish elections in which Labour also won many seats.  The gains for Labour came at the expense of the Liberal Party which was by this stage had declining presence in both national and local elections as well as the Conservative Party.

APG Federal Credit Union Arena: APG Federal Credit Union Arena, originally known as the Susquehanna Center, is an indoor arena at Harford Community College in Bel Air, Maryland.  It hosts indoor sports for HCC's Fighting Owls programs, community and regional events, commencements, concerts, special events, student services, fundraising activities, meetings, conferences and trade shows.  Capacity for sports events has been listed at 2,552, with up to 3,400 seats for indoor floor events such as concerts.

Supporting paragraphs: UFC 33 Mandalay Bay Events Center
Answer: 12,000-seat