UFC Vegas 31 Co-Main & Main Event Preview/Predictions UFC Vegas 31 is slated to go down this weekend in Las Vegas, Nevada, and the co-main and main event will be supercharged following the chaotic night at UFC 264. UFC Vegas 31 will air on ESPN+ and take place within the UFC Apex Facility in Las Vegas, Nevada. In the main event, Islam Makhachev will fight Thiago Moisés in a pivotal lightweight affair. But before we get to the headliner, let’s take a closer look at the co-main event of the evening. After an extended hiatus from the sport of MMA, one of the pioneers of women’s MMA is back, as former bantamweight champion Meisha Tate returns to action against a fellow veteran in Marion Reneau. Despite the show not being a pay-per-view, this card is stacked top-to-bottom, so fight fans are scoring big this week.