The confusion of Banquo’s murder contrasts well with the ceremony of the state banquet.The formality is announced in the first line,”You know your own decrees, sit down” and the scene proceeds with dignity for some time.The appearance of one of Banquo’s murderers disturbs the peace for Macbeth. The state occasion demands courteous behaviour from the king,but when the murderer says that that Fleance has escaped,Macbeth is agitated. Banquo’s ghost,which only Macbeth can see,adds to this distress, until the whole scene breaks into fragments, and Lady Macbeth has to ask her guest to leave, without any of the formality with which they arrived:
Stand not upon the order of your going, But go at once.
The banquet is symbolic as well as realistic .