Explain what was said or what happened in act 3 scene 5 of Macbeth?

On the heath, the witches meet Hecate, queen of witches, who chastises them for meddling in Macbeth's affairs without involving her or showing him any fancy magic spectacles. She tells them that Macbeth will visit them tomorrow and that they must put on a more dramatic show for him. It generally thought that Shakespeare did not write this scene.