What is the climax in Julius Caesar?

Unless the term is used in a technical sense (whereby the "Climax" of a Shakespearean play is always whatever happens in Act 3), the climax of a story is generally the point where everyone's plans reach their fruition and either succeed or fail. In Hamlet, it is when Hamlet actually takes his revenge in Act 5. In Julius Caesar and Macbeth there is an early climax when the murderers complete their murders in Act 3 in Caesar and Act 2 in Macbeth. In Macbeth, his struggle to hold on to his kingdom leads to a further climax when he meets MacDuff in Act 5. In Caesar there is no similar further climax; the conspirators' hope of a joyous revival of the Republic is quickly dashed by Antony and the mob and their revolution fizzles out.