Harvest Festival

The Harvest Festival is an annual world event that takes place in September or October, lasting for one week.

During the Harvest Festival of Azeroth, the Horde and the Alliance give thanks to heroes for the sacrifices - in some cases ultimate sacrifices - they have given on our behalf. In the time of the Harvest Festival, a great buffet is built up outside of Ironforge and Orgrimmar.

From Harvest Festival on the official site:
 * Throughout history, many have given their lives to aid their allies. Every year, members of the Horde and the Alliance set aside time to honor the memories of the fallen and to pay tribute to those whose memories are held most dear: Uther Lightbringer, for the Alliance, and Grom Hellscream, for the Horde. Heroes take time from their adventures to visit the graves of these two great leaders and to leave a tribute to them at the memorial. To show their respect, members of the Alliance light a candle at the Tomb of Uther Lightbringer in the Western Plaguelands. Members of the Horde show their respect to Grom Hellscream by leaving a bottle of spirits at the base of the Hellscream Memorial in Demon Fall Canyon in Ashenvale.

Details
Outside of Orgrimmar and Ironforge are a table and wandering ghostly NPCs of the corresponding faction, Honored Ancestors and Honored Heroes, who can be waved or cheered at, saluted and bowed before.

The following items can be picked up from the table:
 * Harvest Boar
 * Harvest Fish
 * Harvest Fruit
 * Harvest Nectar

Currently, there are no achievements for the holiday to be unlocked, although eating and drinking the items above will count towards Tastes Like Chicken and It's Happy Hour Somewhere.

Quests
Rewards: For the Light!
 * Honoring a Hero (Alliance) from Wagner Hammerstrike at the Gates of Ironforge. The Alliance acknowledges many heroes, but none weave a more tragic tale than that of Uther Lightbringer. People can help to honor Uther by taking an offering to his tomb in the Western Plaguelands.

Rewards: The Horde's Hellscream
 * Honoring a Hero (Horde) from Javnir Nashak outside Orgrimmar. The Horde acknowledges also many heroes, but none exemplify strength and sacrifice more than Grom Hellscream. People can honor Grom by taking an offering to his monument in the Demon Fall Canyon of Ashenvale.

Additionally, 2 days later after completing either quest, the player gets Bounty of the Harvest in the mail. It is an item with a 12 hour cooldown which produces 4 food from the harvest.

New in 2019:
 * Remembrance: Available to tauren characters that have completed the Heritage of the Shu'halo questline.