It's the early fall Huckleberry Feast! You get approximately 100 Food in crates for every 3 minutes of game length, up to 30 minutes.
—In-game description

Klamath Huckleberry Feast is a technology in Age of Empires III: The WarChiefs that can be researched at a Trading Post built on a Klamath settlement once the Colonial Age is reached. Once researched, it ships 100 food for every 3 minutes the game have passed, up to 30 minutes (for a total of 1,000 food).

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