there are huge techno parties going on that weekend in detroit. in fact there is more talent at the after parties than there is at the actual festival. last year it was ridiculous how many big name DJs were in town and were not even playing the fest, but just at after parties. don't even worry about researching it until you get there.. you'll collect about 2 million flyers for this kind of shit within your first hour there.
btw someone asked about this, can't remember who, but the fest is pretty much all detroit-style house and techno. local detroit DJs make up the very great majority of those playing the fest.. that's why you might not recognize so many of the names. it's a good thing there's so many talented DJs in the city