Why does Theseus want entertainment?

Theseus calls for his master of ceremonies to inform him what entertainments are available for them as a part of wedding feast activities. Philostrate, the master of ceremonies, first offers a story about a battle between Centaurs. This is to be performed by an Athenian eunuch, accompanying himself on the harp.

Theseus says that he has already told this story to his bride-to-be, when he was giving her details about one of his relatives