The Kennedy Center presents American Ballet Theatre in Alexei Ratmansky’s Harlequinade for the company’s 2019 engagement. Annually, America’s National Ballet Company makes an appearance in its capital and this year they bring Ratmansky’s reconstruction of Marius Petipa’s classic, comedic ballet Les Millions d’Arlequin. Harlequinade makes its DC premiere less than a year after its world…