Hey Kyle! Probably the easiest is to fly into ATW. Getting down to OSH probably depends upon his arrival date. He could always Uber down any time, shuttle bus service is typically available but I don’t know the schedule. One can also ship stuff to yourself and pick up at the GES site which I believe is behind the convention offices building. Green Bay and Milwaukee are both an hour plus and I’ve never found any convenient way to get to either location. And from what hear WiDOT has started work on 41 north and south of OSH. YEAH