In which books does the Hallowe'en feast take place?

What creature was set loose inside Hogwarts during the Hallowe'en feast in Harry's first year?

Where did the trio battle the Troll?

Mark the decorations used at least once in the Great Hall during Halloween

What was rumored to be the entertainment during the Hallowe'en feast in Harry's second year?

He had extra practice with the Gryffindor Quidditch team

He was at Nearly Headless Nick's Deathday Party

And why wasn't Harry at this feast?

How many days has Nearly Headless Nick been dead when he hosts his Deathday Party in Chamber of Secrets?

Mark the foods served at the party

Mark the ghosts present at the party

And what instrument did the ghost orchestra play at the party?

Justin Finch-Fletchley and Nearly Headless Nick got petrified

Harry gets hit by an enchanted bludger during Quidditch

Mark the events that took place on Halloween in Chamber of Secrets

Which spell are Harry and his fellow first-year students taught at Halloween in Philosopher's Stone?

Remus Lupin started teaching Harry the Patronus Charm

Harry got attacked by dementors during Quidditch

The portrait of the Fat Lady was attacked by Sirius Black

Remus Lupin teaches the third-years how to repel a Boggart

What happened on Halloween in Prisoner of Azkaban?

Hagrid showed Harry the dragons in the Forbidden Forest

The first task of the Triwizard Tournament

What event happened on Halloween in Goblet of Fire?

Peter Pettigrew's last visit at the Potter's

Harry was delivered to the Dursleys by Hagrid

What events happened on Halloween 1981?

How many men were described as apparently being able to sit in the giant pumpkins Hagrid carved for Halloween in Chamber of Secrets?

When the students slept in the Great Hall in Prisoner of Azkaban during Halloween, what colour sleeping bags did Dumbledore conjure up for them?

The International Statute of Secrecy's restriction regarding wearing Wizarding clothing around muggles is inferred to be lowered during Halloween

Alastor Moody found some humour in walking down muggle streets on Halloween to see people's terrified yet impressive expressions on his "costume"

Voldemort was seen by muggles in Godric's Hollow during Halloween of 1981 and was regarded as wearing a costume

There's quite a few crucial occurrences happening on Halloween in Harry Potter that develop and move the story forward, as well as some fun and interesting details to flesh out the world and the characters. Let's see how much you know, shall we?