Romeo and Juliet.The co-production with the Glimmerglass Festival is filled with cavorting Capulet partiers as fun as Madonna’s Celebration Tour dancers and an energized cast with fabulous voices. It is impending doom delivered with entertainment and style.In his debut as an opera director, Simon Godwin — normally seen leading the Shakespeare Theatre Company — brings a naturalness to the performances, which feel almost as if the singers are playing themselves.It’s a warmth that infuses the story, keeping it present and alive.