What started as a one-time Juneteenth event has grown into a national movement — one that is transforming parking lots into powerful engines for Black entrepreneurship. On Saturday, May 9, Black on the Block — the nation’s largest touring marketplace for Black-owned businesses — returns to Houston, bringing more than 100 vendors, live music, and a full day of community-driven commerce to NRG Park. But for sister-founders Lanie and Char Edwards, …