It was originally performed by Najdi tribesmen before going to war.
Interestingly the POTUS ardha was in May 2017, the same month Saudi Arabia made a Japanese company the "most powerful tech company in the world" (relevant as we speak - https://www.nytimes.com/2018/10/18/business/dealbook/softbank-saudi-arabia.html). The Vegas event (at least tangentially connected to Saudi royals) was October 2017. Purge November 2017.