The Roman people are celebrating in the streets. They are celebrating not only the feast of Lupercal, but also Caesars victory over Pompey. The people praise Caesar with their shouts. Brutus says "What means this shouting? I do fear the people choose Caesar as their king." (Act I: Sc ii: ln 79) Brutus is concerned that the people love Caesar to much. Brutus's concern for Caesar having power is important because it's an contributing factor to why Brutus joined the conspiracy.
Act IV: Sc iii
Caesar was warned that he would be in danger on the Ides of March. Calpurnia, Caesar's wife, was worried about him, and convinced him to stay home when the conspirators showed up to walk him to work. The conspirators tell him that he that he has nothing to fear, and appeal to Caesars arrogance. Caesar then says "How foolish your fears look now Calpurnia! I am ashaméd I did yield to them. Give me my robe, for I will go." (Act II: Sc ii: ln 105-107) This is important because Caesar is lead to his death.
Act V: Sc v
The Roman people are gathered for the funeral of Caesar. The people were in support of Brutus until, Antony wins them over with his speech. Antony wages war on the conspirators, and the people back him up. Antony shouts, "In every wound of Caesar's that should move the stones of Rome to rise and mutiny." (Act III: Sc ii: ln 230) This is important because it causes Cassius and Brutus to flee Rome.
The ghost of Caesar appeared to Brutus at Sardis. When Brutus asked why Caesar had come, Caesar replied " To tell thee thou shalt see me at Philippi." (Act IV: Sc iii: ln 283) After encountering Caesar's ghost, Brutus immediately commands his army to get up and march to Philippi. This encounter with Caesar's ghost is important because it foreshadows Brutus' death.
Brutus is loosing the battle with Antony. Brutus had decided that he would rather die than be taken prisoner. He had Strato hold the sword, and he plunged himself on it. His last words were, "Caesar be still; I killed thee with half so good a will." (Act V: Sc v: ln 50-51) Brutus had blamed Caesar for the miscommunication that had caused his friends deaths. Brutus' death is important because justice is served, and the play can end.
"What is this fellow mad?" (Act III: Sc i: ln 9)
Caesar was warned about the Ides of March four times. The first time was by the soothsayer. The second time was Calpurnia's dream of the Romans dipping their hands in his blood. The third time was the sacrifice without a heart, which is a bad omen. The fourth time is when Artemidorus writes Caesar a letter warning him about the conspirators. The theme is do not let arrogance blind your judgement. Caesar was warned, but was too arrogant to heed the warnings.