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World's easiest Harry Potter themed costume: get a picture frame (sans glass and backing), carry it around all night, and tell people you're a wizard portrait. Invite people into your portrait.
Slightly more transportable version of the world's easiest Harry Potter themed costume: construct a picture frame out of cardboard. Fold it up and put it in your bag when it's time to watch the movie.
Slightly more transportable version of the world's easiest Harry Potter themed costume: construct a picture frame out of cardboard. Fold it up and put it in your bag when it's time to watch the movie.