premise: SummerSlam only had a pre-show.
hypothesis: SummerSlam (2011) . Six matches were scheduled for the event , with a seventh was added during the show when Alberto Del Rio cashed in his `` Money in the Bank '' briefcase and defeated CM Punk . SummerSlam (2016) . It was the twenty-ninth event under the SummerSlam chronology , the second consecutive SummerSlam at this particular venue , and the first event under the reintroduction of the WWE brand extension . Twelve matches were contested at the event , including three matches contested on the pre-show .