Answer:
The epic convention displayed in the following passage is invocation.
An invocation is when the poet or narrator addresses a muse, a god, or other supernatural being, asking for inspiration or guidance in the telling of the story. The passage "Sing to me of the man, muse" is an example of this convention as the narrator is asking the muse to sing or tell the story of the man. This is a common convention in epic poetry, used to establish the importance and grandeur of the subject matter, and to emphasize the poetic nature of the narrative.