Black people sure know how to throw a party, and the Juneteenth celebration at the White House was no exception. Since Biden signed it into law in 2021, this third annual event keeps celebrating Black cultural heritage. The White House South Lawn was transformed by Grammy-winning performances into an exclusive, private concert that just happened to be set against the backdrop of the White House. Among the bold-faced names spotted in the crowd were actor Billy Porter, talk show host Tavis Smiley, and NBA star Karl-Anthony Towns. The star of the evening was VP Kamala Harris who was so happy and …