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You'll want to know how to watch the UFC 291 live stream tonight, July 29. The Octagon will move to the Delta Center in Salt Lake City, Utah, for this stacked card. Dustin Poirier will meet Justin Gaethje for a second time. With these fighters being seeded second and third, respectively, Poirier vs. Gaethje 2 will set a pivotal tone for the future of the lightweight division.