Got signed up for
The Driver's Edge @ MSR Houston (same track as the open lapping event I went to), for the weekend of Nov 4-5. Sucks that it's two months out, but really it works best with my schedule, and it's a nice added bonus that it's at the one track I've driven on already (and the closest one, it's about an hour drive from my place).
In the meantime I'm going to keep trying to find time for local SCCA-type events to sharpen up my basic skills and confidence a bit.