You have a few more performances this month before the Washington National Opera season ends. We have reviewed both productions for you at DCist and I recommend them both. On Monday (May 22, 7 p.m.) and Saturday (May 27, 7 p.m.) are the final two performances of Mozart’s La Clemenza di Tito, an opera that is not all that well known but that has some great music — Mozart at the height of his compositional…