This calendar lists important events in the Hogwarts school year as well as a few important events which happened during Harry Potter’s years at the school. Birthdays are not listed here but on their own page.
January
- first week – Hogwarts Express comes back to school from London and winter term starts at Hogwarts
 
February
- 14 – Valentine’s Day – celebrated memorably in 1993 and 1996
 - 24 – (1995) – Second Task of the Triwizard Tournament
 
March
- ? – The death of Dobby the House-Elf (1998)
 
April
- Easter holidays – two weeks, Hogwarts Express transports kids back and forth (the dates vary every year with the varying dates of Easter Sunday)
 - start of summer term at Hogwarts
 
May
- 1-2 – (1998) – The Battle of Hogwarts and the defeat of Voldemort by Harry Potter
 - 29 – (1993) – Harry Potter defeats Tom Riddle in the Chamber of Secrets
 
June
- first week – final exams; N.E.W.T.s and O.W.L.s begin
 - 4 – (1992) – Harry Potter defeats Quirrell/Voldemort in the chamber of the Philosopher’s Stone
 - second week – N.E.W.T.s and O.W.L.s conclude
 - 24 – (1995) – Voldemort is reborn in the Little Hangleton graveyard
 - (1995) beginning of Voldemort’s second rise to power
 - third or fourth week – end of summer term
 - 30 – (1997) – Battle of the Tower and the death of Albus Dumbledore
 - Leaving Feast – awarding of points and House Cup
 - Hogwarts Express travels back to London
 
July
- sometime in July – O.W.L. and N.E.W.T. results are posted to the students by the Wizarding Examinations Authority
 - sometime toward the end of July – letters go out to new students who will be coming to Hogwarts (perhaps these events happen together)
 
August
- last week of the month – many students can be found in Diagon Alley buying supplies for Hogwarts
 
September
- 1 – Hogwarts Express travels from King’s Cross, London, to Hogsmeade Station
 - 1 – start of the school year at Hogwarts
 - 1 – evening: Welcoming Feast, the Sorting
 - 2 – classes begin
 - second week – flying lessons begin for First Years, Quidditch tryouts (PS7)
 
October
- 31 – Halloween
 - 31 Halloween Feast at Hogwarts – 7 pm
 - (1981) – near midnight – the first defeat of Voldemort by Harry Potter
 - (1992) – first attack of the basilisk from the Chamber of Secrets (Mrs. Norris)
 
November
- Hogwarts Quidditch season begins (see Hogwarts Quidditch Teams page for a detailed discussion of the schedule)
 - 8 – (1992) – second attack by the basilisk from the Chamber of Secrets (Colin Creevey)
 - 24 – (1994) – First Task of the Triwizard Tournament
 
December
- first week – McGonagall takes names of students staying over Christmas holidays
 - 17 – (1992) – first attempt at a Duelling Club at Hogwarts, led by Lockhart and Snape
 - 18 – (1992) – third attack of the basilisk from the Chamber of Secrets (Finch-Fletchley and Nearly Headless Nick)
 - third week – end of fall term, Hogwarts Express takes kids back to London
 - 25 – Christmas Day
 - 25 – (1994) – Yule Ball
 - 26 – Boxing Day
 
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