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You can talk about how many people go to live and work in Japan as a means to do kendo training directly from the source. Then you can emphasize how in most cases to get a regular working visa to be able to stay here long term requires a college degree. It doesn't matter what the degree is in, but it requires some degree at least. Hence the whole education opens doors to limitless futures for those who are willing to work for it.

As for activities, I would go more for the hitting shinai held out instead of hitting actual people. They'll have no the tenouchi and some may be lacking in impulse control so you don't want to open yourself to injuries. Demonstrate where the hits go, but actually do them on the shinai if you want to play it safe.

Also you could show them videos from the internet of Shiai so they can see full matches since you may not have a partner to show them a mini jigeiko session with.