I did a mental head count (meaning I counted the number of people I remember said they were coming to this...but we all know how my memory is =w=;), and I'm pretty sure there's 20+ people for this.
But just to be safe, everyone make sure you bring at least $10. And of course I'm sure you might want more if you're actually planning on buying stuff.
And also, the rules for cosplay in the zoo are like those at most malls: costumes are perfectly fine as long as you can easily move in them and won't be hitting people with parts like wings, etc. and no masks (I say if your cosplay includes a mask of some sort, bring it but only wear it for photos, other wise have it off). Props are fine as long as they don't resemble weapons of anykind, meaning no keyblades, no swords and definatly no guns! But props like umbrellas and pokeballs are fine, as long as you're not hitting people with them, on purpose or accedently.
Okay, I think I'm done...
Um, would be nice if what Doe said about the prices and what I said about cosplays were put on the first post, just so everyone can refurence it at later times.