Events that occurred on 20 December.
On Earth
- 1928 - Father Christmas writes a letter to J.R.R. Tolkien's children.
- 1949 - J.R.R. Tolkien writes letter 122a.
- 1954 - J.R.R. Tolkien writes Letter 158a.
- 1955 - J.R.R. Tolkien writes Letter 179a.
- 1955 - J.R.R. Tolkien writes Letter 179b.
- 1956 - J.R.R. Tolkien writes a letter to Deirdre Levinson.
- 1971 - Actor Michael Yurchak is born.
- 1974 - Actor Nathan Clark is born.
- 2002 - Tom Shippey publishes "The Plot Unravels", a review of The Lord of the Rings: The Two Towers in The Times Literary Supplement.
In Arda
- T.A. 3018:
- The Fellowship of the Ring rests in Rivendell and prepare for their quest to destroy the One Ring.