In case you missed the post in the regional forums
http://www.e90post.com/forums/showthread.php?t=638649
1st day on Lightning and 2nd on Thunderbolt.
Decent amount of bmws (and fellow e90post members) already registered: 4 335s, 8 M3s, an M-coupe, a Z4, and a Spec E30, not bad for a PCA event. Plus your normal entourage of Miatas, Lotus's, Vipers, Caterham, GT3s and even some cup cars, oh it'll be fun