After learning the text, please tell me why this drama sketch is about dates. Thank God for his help.

Jujube in Sun Hong? The title of the whole play is "Jujube", which runs through the whole play, allowing the old man and the boy to have a dialogue around "Jujube" and unfold the plot: it happened under an old tree covered with "Jujube" in the country; The opening nursery rhymes express the feelings of parents who love their children in Jujube. The boy met the old man because of "picking up dates"; The old man invited the boy to eat "jujube"; The fortune-teller named the old man's son, and when the son peed when he was a child, he could not do without "jujube"; The old man told the boy the origin of "jujube tree". During the famine, "a jujube fell on the devil's helmet" and the story that the father and son survived by "only 8/kloc-0 jujube" was also inseparable from "jujube". The boy will take "Jujube" home and leave it for his father to eat. The nursery rhyme ending with "sweet jujube, fragrant jujube ……" echoed the opening. In the play, the experience, emotion and even fate of the elderly are inextricably linked with "jujube"; The boy's yearning for his father is also related to "jujube". "Jujube" is the clue of the development of the whole drama festival, and it is also the topic of character dialogue. The structure and content of the whole play are closely related to "Zaoer". "Jujube" is the clue of the full text.