I am surprised no one has tried to answer your question. All 3 of the areas you mention host NASTAR, & all 3 have race departments & snowsports schools. Perhaps contact them via email & ask what kind of set programs they may have. They are large, established areas & you may actually get a response from someone who knows what they are talking about this time of year.
The other option is to tailor your needs through private lessons. At my home area, I end up doing private race clinics for both kids & adults at least a few times a season. We require a minimum 3 hour block of time to set up gates or stubbies with closed hill space. Often times I will be able to attach the lesson with unlimited NASTAR runs for the day at no extra charge.
Also understand that with private lessons, there is usually the initial fee with only a small add-on for additional people. Even though children learn differently than adults, an experienced instructor could make it beneficial for the 3 of you especially in the exclusive environment of a race arena.