To get a furniture item from the Harvest Set, You must talk to Tortimer after 3pm on Harvest Day, (which this year was Nov. 27). Tortimer will give you a Fork and Knife pair, telling you that the "Special Guest" hasn't shown up yet. There will be a Turkey character, Franklin, hiding somewhere in your town. You will be asked to trade him the Fork and Knife that Tortimer gave you. If you do, you'll get an item from the Harvest Set.