Pilgrim’s Bounty is a festival of food and sharing (and the sharing of food) which can be celebrated outside of each of the major cities. There, players will find feasting tables full of wonderful seasonal cuisine which they can help themselves to as well as pass to share with others. This holiday is an in-game version of the harvest festival of Thanksgiving, though it should not be confused with the Harvest Festival which takes place in September.
Completion of the nine-holiday achievements specified by Pilgrim will grant a player title – <Name> the Pilgrim.
Learn more about the holiday in Wowhead’s Pilgrim’s Bounty Guide.
More information on Wowhead.