This is a big week for fans of Harry Potter, the bespectacled wunderwizard of J.K. Rowling's multibillion-dollar fantasy world. ``Harry Potter and the Deathly Hallows: Part 2,'' the final movie of the wildly successful series, debuted on London screens last week. Potter fans, some likely sporting full quidditch regalia, will queue up outside Bay State theaters late Thursday night for the midnight opening here in the US. Kristina Moy, who played quidditch for three years at UMass, will
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