Subordinate events can be replaced with a variety of synonyms to add variety to your writing. Some possible options include secondary events, supporting events, incidental happenings, auxiliary occurrences, additional incidents, and supplementary episodes. All of these terms convey the idea that these events are important, but not necessarily the main focus of the story or narrative. Alternatively, you could use phrases like lesser occurrences or peripheral happenings to describe these events in a more dismissive way. Choosing the right synonym will depend on the context and tone of your writing, but swapping out "subordinate events" for other options can make your writing more interesting and engaging.