Back to the Dinah Hayley (Lady Dinah) clue. If it isn't the Bill & Ted rumor I guessed a while back, I'll take another stab at it...
* "Extended", as many people mentioned, leads to "extended family", which would lead to Uncle John Wilkes.
* John Wilkes immediate brings to mind John Wilkes Booth, who assassinated Abraham Lincoln.
* Abraham Lincoln was featured in the movie Abraham Lincoln Vampire Hunter.
* The clue is for "M", which we don't know yet if it means "marketing", "merchandising", or something else.
* I am going to guess that
HHN30 will be marketing "Vampires" in some fashion - perhaps a return of a Vamp SZ or a mashup Vamp house or a Drac house or something of that nature.
I don’t get a mention for bringing up “The Day the Music Died”?
No - because that would open a rabbit hole for other clues. For this one, it would also be who first mentioned the song American Pie. And the first person who actually mentioned "The Day the Music Died" was
HHN22DidNothingWrong on page 109. But I'm just trying to limit it to answers (or partial answers) to the clue. The answer(s) to this clue were: Cafe La Bamba and 11th house located there. Otherwise, like with the first clue that ended up being The Conjuring, anyone who mentioned Francis Patrick Keough (which is almost everyone) would have to be on the list, which would make it pointless to even pare it down like I'm trying to do. I mean, I was right there on the Fairy Fountain clue and had the 2 main pieces (1888 and Glasgow), but since I didn't put the puzzle together, I didn't give myself the credit for the answer.