That is, does pre-arranging the "stand" make the one night aspect rather irrelevant? You know, generally the participants in a one night stand didn't know each other the day before (and won't the day after, thus the "one night" part).

But supposing you arranged a few days in advance to have a little get-together with someone you'd just met, for the express purpose of sex. Would it still be a one night stand, then?

How about if you actually remain in contract with the person after?