So it turns out that "what's the worst that can happen?" is probably a bad question to ask. It was mostly due to procrastination and lack of planning, but in any event -- the adventure didn't get finished.
I will finish it as I get the time and the will, and happily, this practice is 100% officially approved.
In more encouraging news, my friend Maggie is now officially a DM. With all the joy, wonder, and soul-crushing frustration that blessed activity entails.