premise: SummerSlam was only held in 2014.
hypothesis: SummerSlam ( 1992 ) was the fifth annual SummerSlam professional wrestling pay-per-view ( PPV ) event produced by the World Wrestling Federation ( WWF ) . It took place on Saturday August 29 , 1992 , at Wembley Stadium , London , England , but did n't air on pay-per-view until Monday August 31 . SummerSlam ( 2011 ) was a professional wrestling pay-per-view ( PPV ) event produced by WWE that took place on August 14 , 2011 . SummerSlam ( 2016 ) was a professional wrestling pay-per-view ( PPV ) event and WWE Network event produced by WWE . It took place on August 21 , 2016 at the Barclays Center in Brooklyn , New York .