Also, i think a Facebook Event Page would benefit organizing this shoot; if you want, I can set that up! The reason I would like to try for an official photoshoot over an unofficially organized one is because the heat outdoors can be very detrimental to some peoples' health, especially in cosplay (I passed out from heatstroke last year).
If you'd like, you can go ahead and get a shoot scheduled here (the Otakon 2017 Unofficial Photoshoots thread) : http://www.cosplay.com/showthread.php?t=365964
and I'll keep waiting on the official shoot forms. If I get approved, we can switch to mine, or we can stick with yours, or even just have 2 Vocaloid shoots, perhaps! Whatever floats your boat and fits with your schedule.