When the Triwizard Tournament happened
When a dragon appeared for the first time
When Harry got his O.W.L. (exam)
When Harry and Ron drove the Flying Ford Anglia
When Quirinus Quirrell was the Defence Against the Dark Arts teacher
When Expecto Patronum was first used
When Harry and Ginny started to date
When Sirius Black appeared for the last time (alive)
When Lord Voldemort came back to life (in his own body)
When Scabbers true identity was revealed
When Gellert Grindelwald was killed
When an horcrux was destroyed for the first time
When a member of the Weasley family died
When Severus Snape was no longer the Potions Master
When the Quidditch World Cup happened
When Harry started learning divination
When Avada Kedavra was used the most
When Nearly Headless Nick's five-hundredth Deathday Party took place
When Severus Snape's mother's last name was revealed
Chamber of Secrets
Deathly Hallows
Goblet of Fire
Half-Blood Prince
Order of the Phoenix
Philosopher's Stone
Prisoner of Azkaban
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That my original idea, but first I think that would be too easy (here you have to know the books in order, and I like this idea), and then I would have to add "1-", "2-",... behond each title, so I don't think it would be that beautiful. But thanks for the advise!