You have quite a big collection of tracks until you limit it to karts, lol. Also check out the Outback Track (runs Friday nights) at Susquehanna Speedway - it's even closer than Hunterstown, but doesn't run as many classes.
While the Maxxis series is this Saturday (8/13) at Hunterstown, Saturday 8/20 will be a regular points race unless the 8/13 Maxxis race rains out. Given the way this season has been and the current forecast, a rainout this Saturday is not out of the question, but Hunterstown, like Lincoln for the big cars, is very determined when it comes to dealing with the weather on race day. Given the early start time of Maxxis series races at Htown, an afternoon thunder bumper will just result in a break in the racing of up to an hour while they run the track in again and finish the program.