The BMF title is up for grabs in the main event of UFC 291, as Dustin Poirier and Justin Gaethje meet in a highly anticipated rematch where fireworks are not just expected, but mandatory when two of the best 155-pounders of this era collide. Plus, former champions meet when Alex Pereira makes his light heavyweight debut in a compelling matchup against the owner of “Polish Power,” Jan Blachowicz.