By 11:30 a.m. Sunday, a meaty, righteous aroma wafted up from hundreds of grills set up around the northeastern shore of Lake Merritt. Oakland barbecue stalwart Everett & Jones was flipping yard-long racks of ribs to give away. Vendors of skateboard decks airbrushed with the greats of African American history set up next to political organizers calling out for registered voters. BBQ’n While Black was barely getting started.