It seems the Antifa/BLM/Anti America crowd (Well, a half dozen of 'em at least) decided to stand in the middle of the road for a protest..... in Sturgis....
Found some video of it (Language warnings) and lo and behold, around the 10:52 point in the video a black Valkyrie rides by!
https://youtu.be/vuprbSOaRgk?t=650