You said:
"NARRC could run at those tracks, if the series management desired. They may have bylaws or just a consensus about traveling beyond certain boundaries, but you never know until you ask."
I'm sure that if a region that ran races at at any track other than Pocono, NHIS and Lime Rock wanted to have their event be a NARRC race, then they could. "NARRC" doesn't run races. Regions run races and make a business decision if they want the race to be part of the NARRC series.
AFAIK, to be a NARRC race, then regions must pay (about) $5 per car to the NARRC points fund, and that is about it. If a region thinks that hosting a NARRC event is going to get them a bunch of entries, then they are welcome to have one.
I know that two years ago, my region ran an event that had qualifying, a qualifying race for points in NERRC and a race that was for points in both NERRC and NARRC. It was our business decision to have it be a double NERRC points weekend and only a single NARRC event, not the decision of the NARRC committee.
As for the NARRC committee that oversees the NARRC specific rules, I'd bet that if a region wanted to host a NARRC race, then they would have a member on that committee as well. The NARRC meetings are heald each spring and fall at the divisional conventions and anyone is welcome to attend, see what happens, and speak up. It certainly is not a closed or secret meeting.