Events that occurred on 20 July.
 On Earth
- 1954 – J.R.R. Tolkien receives a D.Litt. from the University of Dublin.
- 1962 - J.R.R. Tolkien writes Letter 239.
- 1962 - J.R.R. Tolkien writes a letter to Alina Dadlez.
- 1965 - J.R.R. Tolkien writes Letter 272.
- 1998 - Mythcon XXIX in Wheaton, Illinois.
- 2000 - The second Tolkien Thing is held in Cologne.
- 2009 - Mythcon XXXX in Los Angeles, California.