Events that occurred on 13 July
 On Earth
- 1949 - J.R.R. Tolkien writes Letter 121.
- 1979 - Mythcon 10 in San Jose, California.
- 2004 - The Lord of the Rings Symphony at Mann Centre in Philadelphia.
- 2006 - The Lord of the Rings: The White Council is announced.
- 2004 - Tolkien Thing VII in Hohensolms, Hohenahr, Germany.
- 2005 - Tolkien Thing VI in Hohensolms, Hohenahr, Germany.
- 2007 - Tolkien Thing IX in Diez, Germany.
- 2008 - Tolkien Thing X in Rieneck, Germany.
- 2013 - Mythcon 44 at Michigan State University, East Lansing.
 In Arda
- T.A. 1944:
- T.A. 3018: