323. That's easily one of the bigger events you'll find. I think June Sprints is the biggest normal-season SCCA event at ~450. The national championship (Runoffs) is ~650.
Group 1 Vintage 21
Group 2 ITB, ITS, IT7, ITR 48
Group 3 ITA, SRF 45
Group 4 FA, FC, FF, FM, S2, CSR, DSR, FV, F500, CF, FS, FB, FE, FST 41
Group 5 SM, SM5 46
Group 6 GT1, GT2, GT3, AS, T1, T2, GTA, SPO, ASR, ITO, STO 44
Group 7 ITC, EP, FP, HP, GTL, T3, SSB, SSC, LEG, SPU, STU, STL 61
Group 8 Camaro Cup 17
Yeah, those are pretty decent grids.
Huge SM field, that's expected I guess. The class has become increasingly popular because it's so cheap and the racing is close. Also, that means the group is populated with racer boys, so they tend to bang eachother a bit too often. Definitely a must watch if you can swing it. The SRFs will be great too, with less banging, more good racing.
Still, I'm shocked Group 4 is all together... that'll be a bit of a clusterfrick. If they didn't have to squeeze the vintage and those Camaro Cup guys in
... It's sorta like mixed class racing with FOX and MRT, and everything in between.
Sorry, I'm rambling to myself because I'm super jealous right now