From troll invasions to Deathday Parties, many notable events in the Harry Potter series took place on 31 October. Here are some particularly memorable Hallowe’en happenings…

Troll in the dungeons

A thousand live bats fluttered from the walls and ceiling while a thousand more swooped over the tables in low black clouds, making the candles in the pumpkins stutter. The feast appeared suddenly on the golden plates, as it had at the start-of-term banquet.
Harry was just helping himself to a jacket potato when Professor Quirrell came sprinting into the Hall, his turban askew and terror on his face. Everyone stared as he reached Professor Dumbledore’s chair, slumped against the table and gasped, ‘Troll – in the dungeons – thought you ought to know.’ He then sank to the floor in a dead faint.
Harry Potter and the Philosopher’s Stone

The troll in the girls bathroom

Happy Deathday to Nick

‘My dear friends,’ he said mournfully, ‘welcome, welcome ... so pleased you could come ...’
He swept off his plumed hat and bowed them inside.
It was an incredible sight. The dungeon was full of hundreds of pearly-white, translucent people, mostly drifting around a crowded dance floor, waltzing to the dreadful, quavering sound of thirty musical saws, played by an orchestra on a black-draped platform. A chandelier overhead blazed midnight blue with a thousand more black candles. Their breath rose in a mist before them; it was like stepping into a freezer.
Harry Potter and the Chamber of Secrets

Nearly Headless Nick greeting guests to his Deathday party

Enemies of the Heir, Beware

Something was shining on the wall ahead. They approached, slowly, squinting through the darkness. Foot-high words had been daubed on the wall between two windows, shimmering in the light cast by the flaming torches.
‘What’s that thing – hanging underneath?’ said Ron, a slight quiver in his voice.
As they edged nearer, Harry almost slipped over: there was a large puddle of water on the floor. Ron and Hermione grabbed him, and they inched towards the message, eyes fixed on a dark shadow beneath it. All three of them realised what it was at once, and leapt backwards with a splash.
Mrs Norris, the caretaker’s cat, was hanging by her tail from the torch bracket. She was stiff as a board, her eyes wide and staring.
Harry Potter and the Chamber of Secrets

PMARCHIVE-Hogwarts PM B2C8M2 HogwartsSecondFloorBethroomFloodedChamberOfSecretsSign Moment 2tOlAZ1QfKiAyE0AMaWOOe-b5

Sirius Black attacks

‘Ashamed, Your Headship, sir. Doesn’t want to be seen. She’s a horrible mess. Saw her running through the landscape up on the fourth floor, sir, dodging between the trees. Crying something dreadful,’ he said happily. ‘Poor thing,’ he added, unconvincingly.
‘Did she say who did it?’ said Dumbledore quietly.
‘Oh, yes, Professorhead,’ said Peeves, with the air of one cradling a large bombshell in his arms. ‘He got very angry when she wouldn’t let him in, you see.’ Peeves flipped over, and grinned at Dumbledore from between his own legs. ‘Nasty temper he’s got, that Sirius Black.’
Harry Potter and the Prisoner of Azkaban

Student and teachers find the slashed Fat lady

Choosing the champions

The Hallowe’en feast seemed to take much longer than usual. Perhaps because it was their second feast in two days, Harry didn’t seem to fancy the extravagantly prepared food as much as he would normally have done. Like everyone else in the Hall, judging by the constantly craning necks, the impatient expressions on every face, the fidgeting and the standing up to see whether Dumbledore had finished eating yet, Harry simply wanted the plates to clear, and to hear who had been selected as champions.
Harry Potter and the Goblet of Fire

PMARCHIVE-AlbusDumbledore PM B4C16M1 DumbledoreAndTriwizardCup V2 Moment 2tOlAZ1QfKiAyE0AMaWOOe-b9

Voldemort’s defeat at Godric’s Hollow

‘You-Know-Who killed ’em. An’ then – an’ this is the real myst’ry of the thing – he tried to kill you, too. Wanted ter make a clean job of it, I suppose, or maybe he just liked killin’ by then. But he couldn’t do it. Never wondered how you got that mark on yer forehead? That was no ordinary cut. That’s what yeh get when a powerful, evil curse touches yeh – took care of yer mum an’ dad an’ yer house, even – but it didn’t work on you, an’ that’s why yer famous, Harry. No one ever lived after he decided ter kill ’em, no one except you, an’ he’d killed some o’ the best witches an’ wizards of the age – the McKinnons, the Bones, the Prewetts – an’ you was only a baby, an’ you lived.’
Something very painful was going on in Harry’s mind. As Hagrid’s story came to a close, he saw again the blinding flash of green light, more clearly than he had ever remembered it before – and he remembered something else, for the first time in his life – a high, cold, cruel laugh.
Harry Potter and the Philosopher’s Stone

The Potter Memorial