Question: When did the venue for the Romero vs Whittaker UFC 213 fight open?

Context paragraphs:
UFC Fight Night: Machida vs. Romero: UFC Fight Night: Machida vs. Romero (also known as UFC Fight Night 70) was a mixed martial arts event held on June 27, 2015, at the Seminole Hard Rock Hotel and Casino in Hollywood, Florida.

T-Mobile Arena: T-Mobile Arena is a multi-use indoor arena on the Las Vegas Strip in Paradise, Nevada.  Opened on April 6, 2016, the arena is a joint venture between MGM Resorts International and the Anschutz Entertainment Group.

UFC Fight Night: Whittaker vs. Brunson: UFC Fight Night: Whittaker vs. Brunson (also known as UFC Fight Night 101) was a mixed martial arts event produced by the Ultimate Fighting Championship held on November 27, 2016, at Rod Laver Arena in Melbourne, Australia.

UFC Fight Night 6: UFC Fight Night: Sanchez vs. Parisyan (also known as UFC Fight Night 6) was a mixed martial arts event held by the Ultimate Fighting Championship on August 17, 2006.  The event took place at the Red Rock Resort Spa and Casino in Las Vegas, Nevada, and was broadcast live on Spike TV in the United States and Canada.  It acted as a lead-in to the season four premiere of "The Ultimate Fighter".  The two-hour broadcast of UFC Fight Night 6 on Spike TV drew a 1.5 overall rating.

UFC Fight Night: Marquardt vs. Palhares: UFC Fight Night: Marquardt vs. Palhares (also known as UFC Fight Night 22) and originally scheduled as UFC Fight Night: Maia vs. Belcher, was a mixed martial arts event held by the Ultimate Fighting Championship on September 15, 2010 at the Frank Erwin Center in Austin, Texas.  The event also served as a lead in to the season premiere of "".

UFC Fight Night: Florian vs. Gomi: UFC Fight Night: Florian vs. Gomi (also known as UFC Fight Night 21) was a mixed martial arts event held by the Ultimate Fighting Championship on March 31, 2010 at Bojangles Coliseum in Charlotte, North Carolina, This was the third time the UFC held an event in Charlotte, but the first since UFC 5.

Fox UFC: Fox UFC Fight Night (previously referred as Fox UFC Saturday for broadcasts on Fox or FS1 UFC Fight Night for broadcasts on other Fox-owned properties) is the branding used for telecasts of mixed martial art competitions from the Ultimate Fighting Championship (UFC) that are produced by Fox Sports.  Previously, "UFC on Fox" was also used as a blanket title for UFC events aired on the Fox network, although since the concurrent launch of Fox Sports 1 and rebranding of Fuel TV as Fox Sports 2 in August 2013, all live UFC broadcasts on Fox-owned networks (including preliminaries, "UFC Fight Night" and "The Ultimate Fighter Finale") have since used the name.

Forrest Griffin vs. Stephan Bonnar: Forrest Griffin vs. Stephan Bonnar is a duo of fights starting in the finals of The Ultimate Fighter 1 contest which received national acclaim, and was highly regarded among fans as one of the most exciting, greatest and memorable fights in the history of not only the Ultimate Fighting Championship (UFC) but of mixed martial arts (MMA) in general.  The bout was voted fight of the year by a poll of over 19,000 readers of the website MMAWeekly.com, and was recognized as the 2005 Shoot Match of the Year by the Wrestling Observer Newsletter.  The fight was credited by Dana White as the "most important fight in UFC history".  The fight was also voted the greatest fight in UFC history in 2009.

UFC 213: UFC 213: Romero vs. Whittaker was a mixed martial arts event produced by the Ultimate Fighting Championship held on July 8, 2017, at T-Mobile Arena in Paradise, Nevada, part of the Las Vegas metropolitan area.

UFC Fight Night: Gustafsson vs. Manuwa: UFC Fight Night: Gustafsson vs. Manuwa (also known as UFC Fight Night 37) was a mixed martial arts event held on March 8, 2014, at The O2 Arena in London, England.  The event was shown live in the UK on Channel 5 and BT Sport and in the United States on UFC Fight Pass.

Supporting paragraphs: UFC 213 T-Mobile Arena
Answer: 2016