I know which place you're talking about, actually! It is cool, but I don't think it'd be practical to move such a large amount of cosplayers outside.
(Edit: Whoops, totally didn't realize I was double posting... sorry.)
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- Emperor Lelouch (Code Geass): 4% (Planning) Otakon 2015
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- Pyrrha Nikos (RWBY): 1% (Planning) Otakon 2015