"By the time Hallowe'en arrived, Harry was regretting his rash promise to go to the deathday party. The rest of the school was happily anticipating their Halloween feast; the Great Hall had been decorated with the usual live bats, Rubeus Hagrid's vast pumpkins had been carved into lanterns large enough for three men to sit in, and there were rumours that Albus Dumbledorehad booked a troupe of dancing skeletons for the entertainment."
The Hallowe'en Feast at Hogwarts School of Witchcraft and Wizardry occurs on 31 October every year. It is festooned with candy-filled pumpkins, bats, orange streamers, water snakes and all sorts of Hallowe'en-related decorations. There is always some entertainment at the end, this may be by the Hogwarts Ghosts who pop out of the walls and do formation gliding. It's a highly anticipated feast which most Hogwarts students look forward to every year.
Professor Quirrell interrupts the 1991 Hallowe'en feast, claiming that there was a "Trollin the Dungeons".===1991===
Shocked staff was that mountain troll ran away.:"Troll - troll in the dungeons - thought you ought to know"