The people, including a carpenter and a cobbler, are celebrating the victory or Caesar in the streets when Flavius and Marullus run into them and ask them why they're celebrating when they were just celebrating Pompey when he was in rule.
Act 1; scene ii; 11-24
The commoners leave and Flavius starts saying that he wants every picture and decoration of Caesar to be ripped down, but Marullus reminds him that it is still Lupercal. Flavius doesn't care.
Act 1; scene ii; 25-31
Caesar calls for Calpurnia to stand in Antony's path during his course and for Antony to touch Calpurnia while his run. This was believed to cure infertility (which Calpunia inferfile).
Act 1; scene ii; 32-47
Calpunia and Antony leave, leaving Caesar, Casca and Brutus. The Soothsayer comes up and tells Caesar "Beware the Ides of March" which is March 15th. Caesar just dismisses the Soothsayer and the situation all together.
Everyone leaves but Cassius and Brutus. Cassius asks Brutus to go to a game with him and he says no. He then asks why he hasn't been himself lately.
Brutus tells Cassius that he has been unlike himself and wuiet because he's been having conflicting thoughts. Cassius assures Brutus that even though he is having these thoughts, he won't let that affect their friendship.