What is the central idea of this excerpt? Cinna the poet is attempting to flee Rome because of his role in Caesar’s assassination, but is caught by the plebeians.
The plebeians mistake Cinna the poet for Cinna the conspirator and decide to tear him to pieces before going after Caesar’s killers.
Cinna the conspirator wants to attend Caesar’s funeral, so he disguises himself as Cinna the poet, but is discovered by the plebeians.
The plebeians are roaming the streets to round up friends of Caesar to bring to Brutus and Cassius

The main themes of the play are: fate and free will with the inevitability of oracular predictions is a theme that often occurs in greek tragedies the conflict between the individual and the state similar to that in sophocles’ “antigone” and   people’s willingness to ignore painful truths both oedipus and jocasta clutch at unlikely details in order to avoiding facing up to the inceasingly apparent truth and sight and blindness the irony that the blind seer tiresius can actually “see” more clearly than the supposedly clear-eyed oedipus, who is in reality blind to the truth about his origins and his inadvertent crimes.

To get what you want you have to work for it.