UFC 291: Poirier vs. Gaethje 2 was a mixed martial arts event produced by the Ultimate Fighting Championship that took place on July 29, 2023, at the Delta Center in Salt Lake City, Utah, United States.

The Delta Center is an indoor venue in Salt Lake City. Opened in 1991, the arena is the home of the Utah Jazz of the National Basketball Association (NBA) and the Utah NHL team of the National Hockey League (NHL). Over the years, it has also hosted other professional sports teams including the Utah Blaze of the Arena Football League and the Utah Starzz of the Women's National Basketball Association (WNBA). With a seating capacity of 18,306 for basketball, up to 16,200 for ice hockey and indoor football, and 20,000 for concerts, the arena offers space for many kinds of events. It has 56 luxury suites and 668 club seats. During the 2002 Winter Olympics, the arena hosted figure skating and short-track speed skating competitions under the name "Salt Lake Ice Center".