My own view on how the Order of the Phoenix should have taken back Hogwarts from the Death Eaters and Snape. Set during the Deathly Hallows Part 2 Hogwarts sneak in through Hogsmeade scene.
The entirety of Dumbledore's Army knows what Harry is doing because in this alternate universe Harry told Ginny what Dumbledore told him to do. They never broke up either, that was a stupid move in the Half-Blood Prince book. She and Harry could've just not shown affection towards one another unless alone somewhere.
This one-shot will be a lot different than the movie as I don't remember every exact thing that happened, but alas, it is a fanfic so things