en Cuevana 3. UFC on ESPN 35: Font vs. Aldo was a mixed martial arts event produced by the Ultimate Fighting Championship that took place on December 4, 2021 at the UFC Apex facility in Enterprise, Nevada, part of the Las Vegas Metropolitan Area, United States. A bantamweight bout between Rob Font and former WEC and two-time UFC Featherweight Champion José Aldo served as the event headliner.