If you are in the CT area, try events with SCDA (
www.scda1.com). They run at Lime Rock, NJMP, NHMS and Watkins Glen. The instructors are all SCCA/NASA racers and of excellent quality with a lot of racing experience. I have found them to be a little less conservative than 'owner club' instructors (with the exception of VZ and another guy with First Settlers PCA), but the sessions seem to be under better control with less cars going off.