Act 1 Scene 1 Opens in Rome on a busy city street on the day of Luperical as Julius Caesar returns from the battle, the defeat of Pompey.
Act 1 Scene 1 Murrellus and Flavius are angry that commoners are celebrating Caesar and warn them that they should rather be on their knees praying the evil away, before "disappearing" into the crowd they dismember the decorations left on Caesar's statue.
Act 1 Scene 2 Caesar begins to embarrass his wife Calpurnia to the whole crowd by reminding Antony to touch her on his way by to cure her infertility. As this happens he hears in the background a soothsayer warn him, "Beware the Ides of March". He is balanced on his pride and brushes it off
Act 1 Scene 2 Brutus, Julius Caesars' right hand man waits aside him until the crowd moves along to the next event. Cassius (a secret enemy to Caesar) and Brutus are left. Cassius begins to plot in Brutus' head that if Caesar takes over it will become just like Pompey, convinving him thats not what he wants for Rome and Caesar will surely ruin it.
Act 1 Scene 3 That same night Cicero runs into Casca on the street and sees him looking up into the night stating there's hot fire dropping out of the sky. Unfortunately, that wasn't the only bad thing he saw that night. A slave boy's hand was lit on fire by a torch, and yet it didn't burn. Then there was a surly lion at the Capitol. Also, a bunch of women were terrified by a vision they swore they saw of men walking the streets covered in flames. Casca reports the strangest thing of all: a nighttime bird was in the market, during the daytime! Since it doesn't get any crazier than that, it's clear all these things are bad omens.
Act 1 Scene 3 As Cassius is talking to Casca accidentally lets the plot to kill Caesar slip.. he swears not to tell and actually wants to join the conspiracy, it just so happens that same night there's a meeting with the rest of the conspirators and one of them (Cinna) stops to talk to the two. Cassius sends Cinna to plant letters all where Brutus will find them acting like common Romans to basically say we praise you but you should kill Caesar.