Looking for a few things this time.
The first fic I don't remember much about the overall plot, only a few scenes, really - there's a bit where Harry (staying at the Leaky Cauldron at Christmastime) bumps into Luna outside in the snow, he finds out that her dad, Xeno, is off in some other country over the holidays, stuck because of bad Floo connection or something, and so he decides to go with her to her home and spend Christmas with her instead of heading over to the Burrow to spend time with Ginny (something which he wasn't particularly keen on doing in the first place). A little later on, Hermione shows up and she's goes off on Harry for not being with Ginny on Christmas, like he's cheating on her or something. If I'm not mixing up my fics, this might also be the one where Harry sees some ghost in her house which does a ghost-of-xmas-past thing and shows him some bits and pieces of Luna in her younger years, including her hugging a tree and when her mother died.
The other fic I'm looking for is where Umbridge stops the political bullshit and starts teaching properly after nearly getting possessed by Voldemort's ring (and halting said possession by lopping off her hand).
And lastly, I'm just wondering if there are any fics where Umbridge (or Snape, really) finally get their wish and Harry gets expelled from Hogwarts? I'm a little shocked, because I can't say I've ever run into one before, but it's sort of a plot that should have happened by now, right?