Rise Again: Tulsa and the Red Summer” will premiere on National Geographic on June 18 at 9 p.m. The documentary will then be available to stream on Hulu the next day, just in time for Juneteenth.Debuting just after the 100-year anniversary of the two-day Tulsa Massacre, “Rise Again” centers on award-winning journalist DeNeen Brown and her search for a mass grave in her native state of Oklahoma.