Final Answer:
Sir Gawain appeals to the Green Knight to grant him his wish of going to Christmas Mass.
Step-by-step explanation:
Sir Gawain: This refers to the protagonist of the medieval poem "Sir Gawain and the Green Knight." Gawain is a knight of the Round Table in Arthurian legend.
Appeals to the Green Knight: In the story, Gawain makes a request to the Green Knight to allow him to go to Christmas Mass. The Green Knight is a mysterious and magical character who challenges the knights of the Round Table.
Grant him his wish of going to Christmas Mass: Gawain seeks permission from the Green Knight to attend the Christmas Mass, a significant religious event in medieval Christian tradition. This request is part of the complex narrative of the poem.