WWE officially announced SummerSlam for 8/21 at Allegiant Stadium in Las Vegas, which based on the routing was the clear favorite of the different stadiums announced.
Really, this was always the choice given Smackdown being taped the night before in Phoenix and a house show the next day in Denver. That ruled out New York, Miami and Nashville. Sources at SoFi Stadium in Inglewood have said it wasn’t happening there and that was the only alternative sight. We were told when WWE planted the five different locations they were considering story with Sports Business Journal that the decision had already been Las Vegas but they were trying to build up interest in announcing the location during NBC’s airing of The Belmont Stakes horse race on 6/5.
The company announced it was the first time SummerSlam will be held in an NFL stadium. That’s both technically true and technically not true. Wembley Stadium, the home of the 1992 SummerSlam show, has hosted NFL games regularly since 2007 and the London Monarchs of the NFL funded World League played their home games at the stadium. But the Wembley Stadium that the 1992 show was held at is a different version of the stadium the NFL games were at.