no TopFlix. UFC 246: McGregor vs. Cowboy was a mixed martial arts event produced by the Ultimate Fighting Championship that took place on January 18, 2020 at the T-Mobile Arena in Paradise, Nevada, part of the Las Vegas Metropolitan Area, United States. A welterweight bout between former UFC Featherweight and Lightweight Champion Conor McGregor and former lightweight title challenger Donald Cerrone served as the event headliner.