17 September

17 September was a date.
17 September 1909 was the second day of a three-day trip to the Lake District for the Tenth Doctor and Martha Jones. Whilst there, they helped the locals search for the so-called "Beast of Westmorland" and intervened in Zygon warlord Brelarn's plot to assassinate King Edward VII. (PROSE: Sting of the Zygons)
The Level Two Careers Fair took place at Coal Hill Academy on 17 September 2016 in the sports hall. (TV: For Tonight We Might Die, Co-Owner of a Lonely Heart)
In 2721, the Vinvocci wrested Tivoli from the Terileptils and exiled them. (PROSE: Time Traveller's Diary)