In act I: Sc 2. A Soothsayer told Caesar to (I:ii:in 18) "beware the ides of March". This is important because, the soothsayer is trying to save Caesars life. But Caesar thinks he is to good to listen to a soothsayer and keeps on walking. Which is as always the way Caesar acts.
Act IV: Sc II
In act II: Sc 1. One night all the conspirators come to Brutus's house to speak to him. They went there so they could be introduced to Brutus. As Cassius said in (II:i: in 94, and 96) "This is Trebonius. This, Decius Brutus. This, Casca; this, Cinna; and this, Metellus Cimber". I think this is important because it is all the conspirators in one house/place.
Act V: Sc V
In act III: Sc 1. Caesar, the conspirators, and the senators all go the the senate. So at that time all the conspirators stab Caesar to kill him. Then Caesar get to Brutus and say (III:i: in 79) Et tu, Brute? Then fall, Caesar. Also I think this is important because Antony thinks Caesar died, was not by the stabs, but by the heartbreak.
Theme Act V : Sc V
In act IV Sc 2. Brutus is laying in his bed think about stuff when Caesars ghost appears. The ghost said in (IV:ii: in 281 - 284) Thy evil spirit, Brutus. To tell thee thou shalt see me at Philippi. Ay, at Philippi. I think this is important because this causes Brutus want to march to philippi that night. Also i think the spirit comes back to haunt Brutus was because, Caesar was heartbroken and was unsettled with Brutus.
In Act V: Sc 5. Octavius, Antony, Cassius, and Brutus are battling. It was Antony Battling Cassius, and during that battle Antony beat Cassius. Then when that battle is over Brutus and Octavius battle, and Octavius loses that battle. After all that Brutus and Antony Battle and Antony wins, so Brutus decides to kill himself. As he says in (V:I: in 50-51 ) Caesar, now be still:I kill'd not thee with half so good a will. I think this is important because everyone thinks Brutus is an Honorable persons and wants to honor him.
In act V. When Brutus killed himself, Octavius and Antony talk about how good he was. They also talked about how they wanted to honor him by burying Brutus in Octavius tent. As Octavius says in (V:V:in 76-79) According to his virtue, let us use him with all respect and rites of burial. Within my tent his bones tonight shall lie, Most like a soldier ordered Honorably. I think the theme of this is treat people how they treat you, even though Brutus killed Caesar Octavius still wants to honor Brutus because he was a good person.