I read an article about (a/the/-) Winterlude festival (festival here is not part of the event's name).
In 2015, she published (a/the/-) book Innocent thoughts of the Innocent mind.
Should I use articles in these sentences or not? Please do not offer to rephrase, I want to know more about these particular grammar structures.
For the first one, usually you would use the here - you are thinking of a specific one, and you either expect the reader to know which one you mean, or intend by using the to convey to them that there is a specific one.
It is possible to use a, but it is unusual, and suggests something like "I didn't know this thing existed until that moment", with perhaps a bit of surprise that such a thing should exist at all.
For the book, both are possible. Using the suggests that you have some familiarity with it, whether or not your readers do; a suggests that you don't know it, or that you expect your readers not to have heard of it. There is not a clear separation between the two cases, though.
