Question: UFC Fight Night: Namajunas vs. VanZant was held in what county?

full_context: Document 1: UFC Fight Night: Maynard vs. Diaz: UFC Fight Night: Maynard vs. Diaz (also known as UFC Fight Night 20) was a mixed martial arts event held by the Ultimate Fighting Championship (UFC) on January 11, 2010 at the Patriot Center in Fairfax, Virginia.
Document 2: UFC 200: UFC 200: Tate vs. Nunes was a mixed martial arts event produced by the Ultimate Fighting Championship held on July 9, 2016, at the T-Mobile Arena on the Las Vegas Strip in Paradise, Nevada.
Document 3: UFC 195: UFC 195: Lawler vs. Condit was a mixed martial arts event held on January 2, 2016, at the MGM Grand Garden Arena in Las Vegas, Nevada.
Document 4: UFC Fight Night: Hendricks vs. Thompson: UFC Fight Night: Hendricks vs. Thompson (also known as UFC Fight Night 82) was a mixed martial arts event held on February 6, 2016, at the MGM Grand Garden Arena in Las Vegas, Nevada.
Document 5: UFC Fight Night: dos Anjos vs. Alvarez: UFC Fight Night: Dos Anjos vs. Alvarez (also known as UFC Fight Night 90) was a mixed martial arts event held on July 7, 2016 at the MGM Grand Garden Arena in Las Vegas, Nevada.
Document 6: Las Vegas Strip: The Las Vegas Strip is a stretch of South Las Vegas Boulevard in Clark County, Nevada, known for its concentration of resort hotels and casinos. The Strip is approximately 4.2 mi in length, located immediately south of the Las Vegas city limits in the unincorporated towns of Paradise and Winchester. However, the Strip is often referred to as being in Las Vegas. Most of the Strip has been designated an All-American Road, and is considered a scenic route at night.
Document 7: UFC 202: UFC 202: Diaz vs. McGregor 2 was a mixed martial arts event produced by the Ultimate Fighting Championship that was held on August 20, 2016, at T-Mobile Arena in Paradise, Nevada, part of the Las Vegas metropolitan area.
Document 8: Reno, Nevada: Reno is a city in the U.S. state of Nevada. It is in Northern Nevada, approximately 22 mi from Lake Tahoe. Known as "The Biggest Little City in the World", Reno is famous for its hotels and casinos and as the birthplace of Harrah's Entertainment (now known as Caesars Entertainment Corporation). It is the county seat of Washoe County, in the northwestern part of the state. The city sits in a high desert at the foot of the Sierra Nevada and its downtown area (along with Sparks) occupies a valley informally known as the Truckee Meadows. It is named after Jesse L. Reno.
Document 9: Las Vegas–Paradise, NV MSA: The Las Vegas–Paradise, NV MSA, also known as the Las Vegas–Henderson–Paradise, NV Metropolitan Statistical Area (2013), is in the southern part of the U.S. state of Nevada, coextensive since 2003 with Clark County, Nevada. A central part of the metropolitan area is the Las Vegas Valley, a 600 sqmi basin that includes the metropolitan area's largest city, Las Vegas as well as the other primary city, Paradise, Nevada. The area contains the largest concentration of people in the state. Cities in the metropolitan area include Las Vegas, Henderson, North Las Vegas, and Boulder City. The metropolitan area is one of the top tourist destinations in the world, drawing over 40 million international and domestic visitors in 2013 with a GMP of US$103.3 billion.
Document 10: Nevada: Nevada (Spanish for "snowy"; see pronunciations) is a state in the Western, Mountain West, and Southwestern regions of the United States of America. Nevada is the 7th most extensive, the 34th most populous, but the 9th least densely populated of the 50 United States. Nearly three-quarters of Nevada's people live in Clark County, which contains the Las Vegas–Paradise metropolitan area where three of the state's four largest incorporated cities are located. Nevada's capital is Carson City. Nevada is officially known as the "Silver State" because of the importance of silver to its history and economy. It is also known as the "Battle Born State", because it achieved statehood during the Civil War (the words "Battle Born" also appear on the state flag); as the "Sagebrush State", for the native plant of the same name; and as the "Sage-hen State". Nevada borders Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast and Utah to the east.
Document 11: Las Vegas: Las Vegas ( , Spanish for "The Meadows"), officially the City of Las Vegas and often known simply as Vegas, is the 28th-most populated city in the United States, the most populated city in the state of Nevada, and the county seat of Clark County. The city anchors the Las Vegas Valley metropolitan area and is the largest city within the greater Mojave Desert. Las Vegas is an internationally renowned major resort city, known primarily for its gambling, shopping, fine dining, entertainment, and nightlife. The Las Vegas Valley as a whole serves as the leading financial, commercial, and cultural center for Nevada.
Document 12: UFC Fight Night: Silva vs. Gastelum: UFC Fight Night: Silva vs. Gastelum (also known as UFC Fight Night 122) is an upcoming mixed martial arts event produced by the Ultimate Fighting Championship that will be held on November 25, 2017 at Mercedes Benz Arena in Shanghai, China.
Document 13: Las Vegas Valley: The Las Vegas Valley is a major metropolitan area located in the southern part of the U.S. state of Nevada. The largest urban agglomeration in the state, it is the heart of the Las Vegas–Paradise-Henderson, NV MSA. The Valley is largely defined by the Las Vegas Valley landform, a 600 sqmi basin area surrounded by mountains to the north, south, east and west of the metropolitan area. The Valley is home to the three largest incorporated cities in Nevada: Las Vegas, Henderson and North Las Vegas. Five unincorporated towns governed by the Clark County government are part of the Las Vegas Township and constitute the largest community in the state of Nevada.
Document 14: Clark County, Nevada: Clark County is a county in the U.S. state of Nevada. As of the 2010 census, the population was 1,951,269, with an estimated population of 2,114,801 in 2015. It is by far the most populous county in Nevada, accounting more than two-thirds of its residents. Las Vegas, Nevada's most populous city, has been the county seat since the county was established.
Document 15: UFC Fight Night: Namajunas vs. VanZant: UFC Fight Night: Namajunas vs. VanZant (also known as UFC Fight Night 80) was a mixed martial arts event held on December 10, 2015, at The Chelsea at The Cosmopolitan in Las Vegas, Nevada.
ground_truth: Clark County