While such plays as “A Christmas Carol,” or ballets including “The Nutcracker,” are Christmas classics, they can also be a bit stale if you’ve seen them every year. This year, you might want to spice up your holiday theater-going with the Cirque Musica Holiday Spectacular. The show mixes your favorite holiday songs, performed by the Louisville Orchestra and conductor Bob Bernhardt, with circus acts by high-flying “aerialists performing feats of strength, skill and grace.”