The National Engineers Week Committee encourages you to reach out to younger students. Use your imagination. For instance, challenge them to have an in-class invention convention. Have the teacher present a problem, such as designing a product to help a disabled person, in advance of your visit, and see what they create. Talk with them about their inventions and about how engineers help people.
Award certificates to everyone.
Or, develop your own hands-on demonstration to do in class. Static electricity, nature of electricity, simple circuit, batteries, series and parallel circuits, safety.