Dolores Umbridge is a sadistic teacher whom Harry encounters. Rowling posted a piece on the website Pottermore with new information about the character's past and revealed how she was inspired to give the cruel teacher a love of bows and kittens.
The event is set to be held on Feb. 5.
The new work will be posted on the Pottermore website on Oct. 31.
According to reports, a building that's being constructed on Rowling's property has 'a striking resemblance' to the home of 'Potter' character Hagrid, who lived in a hut on the grounds of the magic school Hogwarts in Rowling's novels.