How does artemidorus’ role in act 3.1 reflect the theme of fate?

caesar won’t read artemidorus’ letter, which means artemidorus cannot stop caesar’s fate: his assassination.
caesar takes control over his fate, reads his letter, and does not attend the senate on the date of his assassination.
artemidorus writes letters to the conspirators and dissuades them from following through with their assassination plot, changing caesar’s fate.
artemidorus writes calpurnia a letter of warning, and she is able to convince caesar to stay home.