RAHWAY – In observance of Juneteenth, the federal holiday that commemorates the ending of slavery in the United States, Union County PerformingArts Center (UCPAC) will offer two events celebrating Black voices inAmerica. On Thursday, June 19, at 7 p.m., UCPAC’s historic Main Stage will present the 2006 film “Dreamgirls” in 35mm, and on Friday, June 20, at 7 p.m., UCPAC, in partnership with American Theater Group (ATG) and the New Jersey CreativeArts Collaborative (NJCAC) will present “Juneteenth – The Soundtrack of Freedom,” at UCPAC’s Hamilton Stage.