The Harvest Festival is a small celebration to honor the Fallen Heroes of the Horde and Alliance. In Season of Discovery, this event will run from September 13th to September 20th.
Harvest Festival Guide — Season of Discovery
While this holiday may not have the most activities, if you have ever watched the Mages of your raid conjuring food in envy, this could be the holiday for you.
A few days after completing the small quest chain, beginning with Honoring a Hero or Honoring a Hero you will receive Bounty of the Harvest in the mail.
This item enables you to conjure 4 Harvest Bread once every 12 hours.