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Dave,
avoid showing them the full Moon through the EP! It will almost blind them, and if not, they will have such a bright after-effect they won't be able to see where they are walking on there way back to a chair, and they trip over a lot of things and some even get nauseous. Believe me, I have seen this happen to many elderly at our Observatory (even some young'ens). Projecting would definately be the way to go on the Moon.
As far as Mars, Venus, Globs (and possibly even Orion Neb) they would get a great thrill seeing them through the EP.
Great idea and good luck with it!
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