Last updated: early 2020 (so it's not up to date just yet)

I did this for A Little Help from a Snake and it seemed to be a popular idea, so I'm doing it here as well

Here it goes (feel free to correct me if I miss anything important or put the wrong info)

• (offscreen, before events of story) Harry finds journals from his parents and learns of the magical world

• Harry receives his Hogwarts letter and is taken to Diagon Alley by Rubeus Hagrid

• September 1st: Harry boards the train and meets Ron Weasley, Neville Longbottom, Hermione Granger, and Draco Malfoy

• They reach Hogwarts; Harry is Sorted into Ravenclaw

• He starts a tentative acquaintanceship with Snape that eventually forms into friendship

• Draco and Ron get into a fight and drag Harry into it; Harry regrets being curious

• Harry confronts Draco, telling him not to involve him; he also accepts Draco's friendship

• Troll breaks in; Harry is concerned for Snape

• Ron and Hermione think Snape is after something

• Pansy Parkinson is a bitch (and basically takes the place of canon Draco)

• Harry spends time with the Weasleys over the holidays

• Harry uses the Invisibility Cloak to sneak out and finds the Mirror of Erised; he doesn't sneak out again

• Hermione and Ron are stubborn in their belief Snape is up to something

• They make plans to stop Snape; Harry tells Professor Flitwick

• Snape and Flitwick go and find Quirrell; the Philosopher's Stone is broken in the process

• Gryffindor wins the House Cup, and Ravenclaw is second (pushing Slytherin down to third place); Fred and George are among the few besides Harry that aren't happy about it

• The train arrives at King's Cross; Harry reunites with his relatives

• Fred and George notice the stark contrast between Harry and Vernon and are worried

• The twins keep in touch with Harry via owl

• Harry suddenly stops responding, and the twins take their dad's car to rescue him and bring him to the Burrow, where Harry gets his first taste of a real, loving family

• Gilderoy Lockhart (need I say more?)

• The platform closes up; Ron takes the car, while Harry sends a letter and waits; Professor Flitwick takes him to Hogwarts

• Harry befriends Luna Lovegood

• Lockhart's teaching skills are bad (yes, I'm aware this is an extreme understatement)

• Harry hears a voice and tells Snape

• Mrs. Norris is petrified

• Lockhart's dueling club takes place; Harry's Parseltongue abilities are revealed; this is part of what makes people think he's the one opening the Chamber of Secrets

• Ernie Macmillan is among those who believe it's Harry until Justin is petrified; others believe Harry had an accomplice

• Ron gets into the Slytherin common room disguised as Crabbe and finds out Harry and Draco have no idea about the Chamber

• Harry and Ron figure out where the Chamber is

• Ginny is taken, and Harry and Snape go down to the Chamber; the memory of Tom Riddle is there

• There's a brief battle; Harry stabs the diary and Riddle is gone; Ginny wakes up

• The end of the year; Harry gives his telephone number to the twins

• Harry runs away from Privet Drive after Aunt Marge makes disrespectful comments about James and Lily; he meets up with the Weasley family

• Harry boards the train and recognizes Remus Lupin, who is surprised by this

• A dementor comes onto the train, but Remus drives it away

• Draco is a drama queen during Care of Magical Creatures

• Harry and the twins argue about riding a broomstick vs. a hippogriff and agree to try them both out to see for themselves

• Harry rereads his parents' journals and realizes Sirius Black is innocent; he then heads to the D.A.D.A classroom, where he is faced with the door of the cupboard

• Fred cheers him up by reminding him of their deal; he and Harry ride Buckbeak and have a little moment together afterward (the start of Frarry); Harry falls for Fred twice, once because he nearly slipped off his broom and then because Hagrid clapped him on the back

• First Hogsmeade weekend; Harry visits Remus and tells him of Sirius' innocence and makes it clear he doesn't care about Remus' furry little problem, much to Remus' confusion and Snape's amusement

• First Quidditch match: Harry feels dementor's effect and goes to the hospital wing for some chocolate

• Fred comes in, concerned, and they share another moment until George interrupts (thanks a lot, George)

• Another Hogsmeade weekend; the twins give Harry the Marauder's Map and learn of Moony's identity; Remus is baffled but amused (and gets a nagging suspicion of Fred's crush on Harry)

• Patronus lessons begin after holidays; Remus questions Harry about his feelings for Fred; Harry mentions the Dursleys and Remus is angry on his behalf

• Remus goes to the Shrieking Shack and reunites with Sirius; Snape comes to a wrong conclusion that is rectified by Harry's (and Luna's) appearance

• Peter Pettigrew is summoned and forced to transform back into his human self; Harry Stuns him and they all start heading back to the castle

• "Wait, you're a Ravenclaw?"

• Full moon = uh oh

• Thankfully, Pettigrew doesn't escape and Sirius is freed (take that, canon!)

• The twins figure out Sirius is another Marauder; Sirius tells them Harry is the son of Prongs

• Sirius catches on to Harry's crush on Fred and joins the unofficial Frarry Express alongside George and Remus

• Grimmauld Place > Privet Drive

• Harry gets his eyesight fixed (yeah!) and the sex talk (unyeah!)

• (offscreen) Pettigrew escapes Azkaban

• Harry has a vision and goes to Sirius and Remus for comfort

• Quidditch World Cup: Harry, Sirius, and Remus meet up with the Weasleys

• Sirius and Remus warn Fred not to hurt Harry

• The Malfoys lead Harry's family to the Top Box

• Death Eaters attack the next morning; Harry returns home

• Harry begins his fourth year; it goes as normal until Harry's name is pulled; he convinces everyone he didn't intend to participate; Sirius sends Dumbledore a howler

• Rita Skeeter writes about Harry and Luna; Fred is not happy even though Harry is gay

• Before the First Task, Fred speaks with Harry; Skeeter insults Fred's family

• Yule Ball is announced; Harry and Fred finally admit their feelings and go together

• Ron is supportive of his brother (why is he almost always homophobic in fics?)

• Harry and Fred figure out the egg together

• Sevond Task: Fred is the thing Harry would miss most

• Another Skeeter article: Fred is accused of using a love potion; Harry tries to figure out how Skeeter is doing it

• Harry tells Sirius and Remus about his vision and his theory on Skeeter

• (offscreen) Third Task; Voldemort is back, but Cedric lives (because I said so, so shoo)

• Most do not believe Harry about Voldemort's return

• (offscreen) Rita Skeeter is exposed as the insect she is

• Harry has nightmares and sleeps with Remus and Sirius for comfort; later, they visit Godric's Hallow to see the Potters' graves

• The Order of the Phoenix has reformed

• Harry and Fred find a compartment with Luna; upon arrival to Hogwarts, Luna pets a Thestral (Harry cannot see it because Cedric lives, ha!)

• Dolores Umbridge gives her dull speech; Harry doesn't like her already (well, no one does)

• Up in the dorm, Terry and Michael do not know whether they believed Harry or not; nevertheless, they're still friendly toward him

• Umbridge is worse than Lockhart; she gives Harry detention; the news spread around like wildfire

• Fred is preparing to give Umbridge something in revenge, but Hermione convinced him not to take action... for now

• Harry's detention goes as badly as it does in canon; he doesn't tell anyone, but Luna catches sight of his hand eventually and convinced him to tell someone

• Next morning, Harry goes to Professor Flitwick, who is furious and leaves to tell Dumbledore; Fred and Luna are waiting for Harry; they go down to the Great Hall for breakfast

• Quidditch practice goes badly for Gryffindor; Ron is a bag of nerves and hits Fred in the face with the Quaffle; Parkinson's still a bitch

• Fred is taken to the hospital wing; Percy sends him a letter advising him to break up with Harry; Fred refuses

• Umbridge seems to go mad during breakfast; Flitwick uses this opportunity to search her office for the blood quill— he finds several

• Hermione (and Ron, but he won't take credit) gets an idea to teach some students D.A.D.A in secret; Harry agrees

• Umbridge turns out to be homophobic; Snape comes to the rescue before the situation worsens; Fred has a feeling he knows about Hermione's idea

• Umbridge is exposed for her illegal use of blood quill; she tries to curse Harry and gets attempted use of Unforgivable added to her charges

• Harry is vividly reminded of Voldemort's resurrection and has to go to calm down

• Lucius Malfoy replaces Umbridge as D.A.D.A teacher; he doesn't make Harry's life hell, but he's still pretty useless here

• Hogsmeade weekend: several students gather at Hog's Head to discuss where to meet

• Sirius and Remus pop into the fireplace to check in on Harry; they discuss where the Defense group can meet; Dobby suggests the Room of Requirement