Zara's rules for record-breaking fun

Ten-year-old (nearly eleven) Zara's nickname is "Queen of the Neighborhood" because she organizes the other children (even the older ones), sets the rules, and generally makes sure everyone has fun; but now another ten-year-old, Naomi, has moved in across the street and she has her own ideas about fun games, and suddenly the other kids (even Zara's younger brother Zayd) are listening to Naomi--if she is going to retain her influence Zara needs to come up with something quick, and an old copy of the Guinness Book of World Records gives her an idea.