Hiya! I actually don't live in NYC, but if you want to get in touch with comic cosplayers, might I suggest the East Coast Avengers? It's marvel only, but a lot of them are from NY (that I've seen). You should try looking them up ^_^
"The day I can't mutilate thirty radioactive teenagers is the day I hang up my coat for good."
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~ Zork: Grand Inquisitor