Events that occurred on 6 September.
 On Earth
- 1939 - Voice actor Gordon Reid is born.
- 1970 – The first Mythcon is held at Harvey Mudd Collegein Claremont, California.
- 1971 - Mythcon II in Santa Barbara, California.
- 1973 - A requiem Mass for J.R.R. Tolkien is held in the Church of St Anthony of Padua in Headington, Oxford. Father Robert Murray assists.
- 1975 - Oxonmoot 1975 at the Welsh Poney, Oxford.
- 1992 - The first part of the 1992 radio series of The Adventures of Tom Bombadil is aired on BBC Radio 5.
 In Arda
- T.A. 3018:
- T.A. 3019: