Question: UFC Fight Night: Rodríguez vs. Penn was held at the arena in the downtown area of what city?

Context paragraphs:
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.

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.

Talking Stick Resort Arena: Talking Stick Resort Arena is a sports and entertainment arena in downtown Phoenix, Arizona, United States.  It opened on June 6, 1992, at a construction cost of $89 million.  It was known as America West Arena from 1992 to 2006 and as US Airways Center from 2006 to 2015.

UFC Fight Night: Lamas vs. Penn: UFC Fight Night: Lamas vs. Penn (also known as UFC Fight Night 97) was a planned mixed martial arts event that was set to be held by the Ultimate Fighting Championship on October 15, 2016, at the Mall of Asia Arena in Pasay City, Philippines.

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 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.

UFC Fight Night: Rodríguez vs. Penn: UFC Fight Night: Rodríguez vs. Penn (also known as UFC Fight Night 103) was a mixed martial arts event produced by the Ultimate Fighting Championship held on January 15, 2017, at Talking Stick Resort Arena in Phoenix, Arizona

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 "".

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.

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 Fight Night: Rodríguez vs. Penn Talking Stick Resort Arena
Answer: Phoenix, Arizona