There are several synonyms for the word "non-event" that can be used to describe an occurrence that is not noteworthy or significant. One such synonym is "non-issue," which refers to a situation or event that is not controversial or important enough to warrant discussion or attention. Another synonym is "unremarkable," which suggests that an event or occurrence is not notable or remarkable in any way. "Insignificant" is another synonym, indicating that something is of little importance or consequence. Finally, "mundane" is a synonym that refers to something that is commonplace or ordinary, lacking in excitement or interest. These synonyms help to convey the idea of something that is not noteworthy or memorable.