The Party Field was a large piece of land which lay below the beautiful gardens of Bag End in the Shire. A single tree stood there, the 'Party Tree', and was here that Bilbo Baggins held his famous Farewell Birthday Party on TA 3001 September 22.
During the War of the Ring, Saruman ordered his henchmen to destroy the tree and everything around it. Returning to the Shire, Sam Gamgee found that the tree was lying lopsided in the middle of the field. Later, Sam replaced it by planting a single mallorn seed given to him by the Lady Galadriel. By spring of TA 3020, the tree had rose and was the only Mallorn tree outside the great forest of Lorien.