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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- Rose Lalonde "Glow" Tier (Homestuck): 95% (Detailing) Otakon 2014
- Fancy Mewtwo Gijinka (Cowslip Gijinka): 3% (Planning) Otakon 2014
- Secret Cosplay (???): 1% (Planning) Katsucon 2015
- Magic Armor Link (LoZ: Twilight Princess): 15% (Patterning) MAGfest 2015