How could this be all white? Organizers of a South Carolina town’s Juneteenth events have issued a groveling apology for advertising the holiday marking the emancipation of black slaves with a banner showing only a white couple. The seemingly colorblind promos for Juneteenth GVL’s June “mega fest” went viral soon after they were put up across Greenville — sparking outrage and even calls for a boycott. “You want to celebrate the depth of black culture on Juneteenth by putting white [people] as the face of it?” one outraged critic tweeted the organizers. “How were you not aware how problematic that...