Those are jingle dresses. There are typically 3 styles of dancing for women, jingle, traditional and fancy.
For men, the dances are Fancy, Traditional, Grass and Chicken although I'm not to familiar with chicken.
You can typically tell them apart by their outfits. My uploads are full so I'll look around online for some pics for you.
There's a couple other special types of "characters" who sometimes visit the pow-wow...out west here anyways. One is a Windigo or "backwards" person. He's a little like a zombie I guess, but not really all that evil. He does everything backwards, its a little frightning actually. If he touches something that belongs to you then your obligated to basically give it to him. But windigo's are few and far between, and you should feel lucky to have seen one...like seeing a leprachon or something. i got lucky and saw one once, but others have gone to hundreds of pow-wows and never seen one.
There was a smoke dancer at this pow-wow. She was dressed in white and danced alone in the dark. I missed it but alot of people say it was a very beautiful sight.
CKA Elite 
