So at the risk of being stalked (very slim), I'll post about the festival I'm going to this weekend.
I went last year too and it was waaaay cool (sorry the pun)
FDGD FestivalStory behind the festival
If you are ever in that area at the time, I say go, go, go!
I've also attended Mardi Gras, Cinco De Mayo, Patrick's Day, but they are very mainstream.
What cool festivals taht are not mainstream have you guys attended?