Question: Where in Iowa's second largest city was an Ultimate Fighting Championship held?

Context paragraphs:
UFC on Fox: Johnson vs. Reis: UFC on Fox: Johnson vs. Reis (also known as UFC on Fox 24) was a mixed martial arts event produced by the Ultimate Fighting Championship held on April 15, 2017, at the Sprint Center in Kansas City, Missouri.

UFC 3: The Ultimate Fighting Championship III (later renamed UFC 3: The American Dream) was a mixed martial arts (MMA) event held by the Ultimate Fighting Championship (UFC) on September 9, 1994, at Grady Cole Center in Charlotte, North Carolina.  The event was seen live on pay-per-view in the United States, and was later released on home video.

Cedar Rapids, Iowa: Cedar Rapids is the second largest city in Iowa and is the county seat of Linn County.  The city lies on both banks of the Cedar River, 20 mi north of Iowa City and 100 mi northeast of Des Moines, the state's capital and largest city.  It is a part of the Cedar Rapids/Iowa City Corridor of Linn, Benton, Cedar, Jones, Johnson, and Washington counties.  Until massive flooding in 2008, the city's government was headquartered in the Veterans Memorial Building, near the Linn County Courthouse and jail on Mays Island in the Cedar River; Cedar Rapids was one of a few cities in the world, along with Paris, France, with governmental offices on a municipal island.

Antônio Rodrigo Nogueira: Antônio Rodrigo Nogueira (] , born June 2, 1976), better known as Minotauro, is a semi-retired Brazilian mixed martial artist known for his technical mastery of Brazilian jiu-jitsu.  He won most of his fights via submissions.  He competed in the heavyweight division of the Ultimate Fighting Championship (UFC), where he is a former Interim UFC Heavyweight Champion.  He is the twin brother of UFC fighter Antônio Rogério Nogueira.  Nogueria rose to prominence in the Japanese promotion Pride Fighting Championships, where he was the first Pride Heavyweight Champion from November 2001 to March 2003, as well as a 2004 PRIDE FC Heavyweight Grand Prix Finalist.  He is one of only three men to have held championship titles in both Pride Fighting Championships and the Ultimate Fighting Championship (the others being Mauricio Rua and Mark Coleman).

UFC Fight Night: Pettis vs. Moreno: UFC Fight Night: Pettis vs. Moreno (also known as UFC Fight Night 114) was a mixed martial arts event produced by the Ultimate Fighting Championship held on 5 August 2017 at Arena Ciudad de México in Mexico City, Mexico.

UFC 1: The Ultimate Fighting Championship (later renamed UFC 1: The Beginning) was the first mixed martial arts event by the Ultimate Fighting Championship (UFC), held at the McNichols Sports Arena in Denver, Colorado, on November 12, 1993.  The event was broadcast live on pay-per-view and later released on home video.

UFC Fight Night: Rodríguez vs. Caceres: UFC Fight Night: Rodríguez vs. Caceres (also known as UFC Fight Night 92) was a mixed martial arts event produced by the Ultimate Fighting Championship held on August 6, 2016, at Vivint Smart Home Arena in Salt Lake City, Utah.

UFC 2: The Ultimate Fighting Championship Part II (later renamed UFC 2: No Way Out) was a mixed martial arts (MMA) event held by the Ultimate Fighting Championship (UFC) on March 11, 1994, at Mammoth Gardens in Denver, Colorado.  The event was seen live on pay-per-view in the United States, and was later released on home video.

UFC 21: UFC 21: Return of the Champions was a mixed martial arts event held by the Ultimate Fighting Championship on July 16, 1999 at the Five Seasons Events Center in Cedar Rapids, Iowa.  The event was seen live on pay per view in the United States, and later released on home video.

UFC Fight Night: Chiesa vs. Lee: UFC Fight Night: Chiesa vs. Lee (also known as UFC Fight Night 112) was a mixed martial arts event produced by the Ultimate Fighting Championship held on June 25, 2017, at Chesapeake Energy Arena in Oklahoma City, Oklahoma.

Supporting paragraphs: UFC 21 Cedar Rapids, Iowa
Answer: Five Seasons Events Center