The ides of March are come.Ay, Caesar, but not gone.Hail, Caesar. Read this schedule.Trebonius doth desire you to o’erread,At your best leisure, this his humble suit.O Caesar, read mine first, for mine’s a suitThat touches Caesar nearer. Read it, great Caesar.What touches us ourself shall be last served.Delay not, Caesar; read it instantly.What, is the fellow mad?Sirrah, give place.What, urge you your petitions in the street?Come to the Capitol.
Caesar doesn't know he is in danger but the audience does. "but not gone" warns Caesar that danger has not went away. shows foreshowding . Caesar is praise but soon is going to be betrayed which shows irony. Caesar is confident, and dismissive showing is character.