UFC mixed martial arts event in 2017 UFC 219: Cyborg vs. Holm was a mixed martial arts event produced by the Ultimate Fighting Championship held on December 30, 2017, at the T-Mobile Arena in Paradise, Nevada, part of the Las Vegas metropolitan area. 424,962 views on December 31, 2017 — Wikipedia's most-read article that day. Also most read: List of Black Mirror episodes, Cris Cyborg, Black Mirror, Princess Margaret, Countess of Snowdon. Wiki link