Watch UFC on Fox 29: Poirier vs. Gaethje (2018) : Full Movie Online Free UFC on Fox 29: Poirier vs. Gaethje was a mixed martial arts event produced by the Ultimate Fighting Championship that was held on April 14, 2018, at the Gila River Arena in Glendale, Arizona. The event was headlined by a lightweight bout between Dustin Poirier and former WSOF Lightweight Champion Justin Gaethje.