You have to trade in the fork & knife set to Franklin for pieces of the Harvest Furniture Set.

Fork & Knife - Talk to Tortimer on Harvest Day
Harvest Bed - May be recieved from Franklin for the Fork & Knife
Harvest Bureau - May be recieved from Franklin for the Fork & Knife
Harvest Chair - May be recieved from Franklin for the Fork & Knife
Harvest Clock - May be recieved from Franklin for the Fork & Knife
Harvest Dresser - May be recieved from Franklin for the Fork & Knife
Harvest Lamp - May be recieved from Franklin for the Fork & Knife
Harvest Mirror - May be recieved from Franklin for the Fork & Knife
Harvest Rug - May be recieved from Franklin for the Fork & Knife
Harvest Sofa - May be recieved from Franklin for the Fork & Knife
Harvest Table - May be recieved from Franklin for the Fork & Knife
Harvest TV - May be recieved from Franklin for the Fork & Knife
Harvest Wall - May be recieved from Franklin for the Fork & Knife