A very simple but very powerful thing that I used to do with school groups at our observatory is to find out when the ISS is passing overhead at your location next (use Heavens-Above.com or similar). Just beforehand, had a chat with them about the ISS, living & working in space, show them pictures (or video) of living in that environment.

Then take them outside and show them the real thing as it passes over. It 'personalises' the experience deeply for them!

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"I'd take the awe of understanding over the awe of ignorance any day." - Douglas Adams