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Every magical child has a place at Hogwarts. Upon birth their names magically appear in a book and offers of admission are sent by owl they summer of the year they are to start school. (The year they are 11) Not every parent chooses to send their child to Hogwarts, however, attendance was mandatory for half-bloods and pure-bloods during the 1996-1997 school year. Muggleborns were expelled. (when the Dark Side took control of the school.)