Add some mystery. For example, there could be a secret admirer who sends anonymous gifts to a student during the homecoming week. This creates suspense and excitement as everyone tries to figure out who it is.
Introduce a competition element. Have different classes compete against each other in various homecoming - related tasks like creating the best mural, having the most energetic pep rally, or making the most creative costumes. This would make the story more exciting as the classes strive to outdo each other and claim victory at homecoming.