It's the wizarding world's worst-kept secret: Hogwarts is coming to Kogarah. Whether you're Gryffindor brave, Slytherin cunning, Ravenclaw sharp or Hufflepuff loyal, your house needs you. Harry Potter Trivia Night is coming to St. George Leagues Club on Tuesday, 6 October and only the truest witches and wizards will leave with bragging rights. We're talking…