@OffTheRunTrades Ferguson 2014 Aug 9 to Aug 25 2014: SPX on Aug 9= 1910, on Aug 25:  1990...( ignore Ukraine drama through that summer) but ...
 Also 2002, 2008 and 2018 had no riots at least listed on wiki for US 3 of the worst(or nearby) $SPX years for annual returns this century