Go to the photoshoots. Easiest way to find someone who at least has one thing in common with you.
Take someone's picture if you like their cosplay. You can usually start a small conversation with the cosplayer IF 1)the cosplayer doesn't have to be somewhere, and 2)three or more other people are not taking a photo as well.
I feel it's pretty easy to talk to the few people that bring something to play music with and dance in a non crowded space. I doubt many people actually stop to dance with them so the group must be happy to have someone join them.
Life's a fleeting dream don't let it go.
Ya gotta make the most of it you know.
Don't stop now, don't let it slip away,
Facebook Cosplay Page
Next Stop: Otakon 2013
Bringing: Genderbend Tidus Malon Sailor Mars Faye Valentine