7 books
7 years of school
7 Weasley children
7 the 7 potters
7 tasks to the sorcerers stone (book version)
7 is Harry’s quidditch number
7 players on a quidditch team
7 secret passageways into Hogwarts
James and lily began dating in there 7th year
Gryffindors common room is on the 7th floor
Room of requirement is on the 7th floor
Harry and Neville were born in the 7th month (July)


Then somebody comes along and makes 8 movies!