Ask yourself certain questions about the memoir. Like, who, what, when, where, and why. Don't go off topic just write about that one specific event.
They find out that they are on opposite families and in their world they are not allowed to date if that is true. The story and/or movie shows and states the scene of the act.
Keywords if i'm not mistaken. Length has nothing to do with the type, headings could but not as much as key words, nor does the title.