You are nearly ready to compete in the grand melee. To prove yourself worthy of this honor, you must defeat a champion of the Argent Crusade.
Go to the stables outside the pavilion, equip your lance, and mount up. Speak to Squire Danny at the Argent Valiants' Ring on the western edge of the grounds. The squire will call out your opponent when you're ready.
After the battle is concluded, we will speak of the outcome.
You have proven yourself worthy of the title of champion, <name>. You will compete at the tournament's highest level, riding in the grand melee and crushing the competition under the banner of Silvermoon.