Preface, I'm a retired US Army Warrant Officer, taught high school shop, and tech school auto mechanics. There are a lot of resources available from outside the public school system. The elementary school may be a little below my suggestions. Basically, suggesting to look around for resources.
US military. Contact the local recruiters from the various branches of service. The military branch will bring in demonstrations and explain the requirements, benefits, and educational opportunities. I had the local Reserve unit fly in a helicopter. Had the US Army Engineer School bring in heavy equipment. Coordinated the Engineer School visit with the school Superintendent. Superintendent wanted some grading conducted, which the engineers did on their visit. Actually did this several times. Made me look real good in the Superintendents eyes. The Engineers/demonstrators gave the Superintendent a band to hang around his neck to display the ID badge and keys, which he proudly wore.
Before you jump, only 1 in 10 military member is a "shooter". 90% are support; lawyers, medics, food service, mechanics, construction, police, etc., etc..
Local electric utility company has a static display board. The demonstration covered how electricity was generated, transmitted, and electric safety.
I brought in my aunt to explain and demonstrate hot air balloons.
Wife and I owned a furniture refinishing business. Wife gave classes on finishing wood projects.
Contact the state's Dept. of Transportation and Conservation (wildlife). In Missouri, these departments have trailers for displays and lectures.
