Parents' Day at Hogwarts

A deal has been made with the professors of Hogwarts and the Ministry of Magic to organize a day where the parents of Hogwarts students are invited to Hogwarts for a day. Of course, Ron's and Hermione's parents will be there, but there is a problem for Harry: since his parents are dead, that means that he and his friends will have to put up with the presence of his aunt and uncle.