Events that occurred on 15 September.
On Earth
- 1939 - J.R.R. Tolkien writes Letter 36b.
- 1973 - "A Tribute to Tolkien" is published by Robert Murray in The Tablet.
- 1974 - The first Oxonmoot is held at The Welsh Poney, Oxford.
- 1977 - The Silmarillion is published.
- 1995 - Oxonmoot 1995 at University College.
- 2002 - Oxonmoot 2002 at St Antony's College.
- 2004 - A new Swedish translation of The Lord of the Rings, made by Erik Andersson, is published.
- 2006 - Oxonmoot 2006 at Somerville College.
- 2007 - Oxonmoot 2007 at Lady Margaret Hall.
- 2019 - Oxonmoot 2019 at St Antony's College.