Originally Posted by ChrisSlicks

For driving instruction look to BMW CCA, Audi Club North America, and SCCA. Some of the other clubs offer instruction as well, e.g. NASA, Chin Motorsports, TrackDaze, Hooked on Driving, and MVP Track Time. You usually need to book at least 1 to 2 weeks in advance so they can figure out if they have enough instructors.

Just about all the major events are listed here:
MotorsportReg.com : Online registration management tools for driving and social events