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I wonder how we can get Olesia to even interact with all the characters anyway? I don't see a reason for her to be anywhere near Hogwarts. One possibility I can think of is I guess after some incident, they allow some Muggles access to Hogwarts for a day as a gesture of goodwill.
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I'm thinking that'd have to be it.

Or maybe Muggles are permitted to visit Hogsmeade?