Events that occurred on 1 September.
 On Earth
- 1917 - J.R.R. Tolkien is working on 'The Grey Bridge at Tavrobel' while in Brooklands Officers' Hospital, Kingston-upon-Hull.
- 1938 - J.R.R. Tolkien goes on holiday to recuperate (see Letter 33).
- 1964 - J.R.R. Tolkien met Clyde S. Kilby
- 1971 - Actor Dave Wittenberg is born.
- 1977 - Cliffs Notes on Tolkien's The Lord of the Rings and The Hobbit is published.
- 1989 - Oliphaunt is published.
- 2009 - The Lord of the Films is published.
- 2011 - A Tolkien Tapestry is published.
- 2011 - A Critical Companion to J.R.R. Tolkien: A Literary Reference to His Life and Works is published.
- 2011 - J.R.R. Tolkien, a children's book from Holiday House, was published.
- 2016 - Songs of Sorrow and Hope: The Art of Jenny Dolfen is published.
- 2016 - Tolkien Calendar 2017 is published.
- 2020 - Tolkien Calendar 2021 is published.
 In Arda
- T.A. 3018:
- T.A. 3019:
- Full moon