It's time to get "Happy," as there's a Juneteenth movie musical in the works at Netflix from producers Kenya Barris and Pharrell Williams, who aim to celebrate the burgeoning holiday commemorating the end of slavery in the United States. Juneteenth is celebrated on June 19 because it was that day in 1865 when General Granger arrived in Galveston, Texas to announce that slaves were now free. The holiday was first celebrated in Austin in 1867, and within five years it was listed on a "calendar of public events. The day has taken on an even deeper meaning this …