I will be out there on Friday and staying all weekend.
The drive is about 2hr 45min from the airport. You take I-94 to Exit 43 (watervliet) and head North for about 16 miles until you hit US31/I-196 head North to Phoenix Rd (1st exit)then head east for about 5-6 miles and you're at the track. Gates usually open around 8am.
It is a bit of a drive, but it's the time of the year for nice drives... Plus I would imagine some of the Chitown and West Great lakes guys would probably join us out there.
-Mark