Lightweight, Part 3, Conor McGregor vs Dustin Poirier Fight Video January 23, 2021. Watch Poirier vs McGregor UFC 257, official main event of the evening at Etihad Arena on Fight Island in Abu Dhabi Free Replay Online. It will be shown on pay-per-view TV in the UK and is on BT Sport Box Office. Their coverage will begin at 1am on Sunday morning.