I think there are several clubs that run at NJMP. You may want to check out TrackDaze, SCCA and NASA (like mentioned). If you feel like making a longer trip, there are several of us that run at summit point in WV throughout the year with SCCA.
Check it out - http://www.wdcr-scca.org/TrackDaysTr...9/Default.aspx
Im also seriously considering doing a track day at NJMP this season. Been there several times just never on track.