We are actually going to be there the 22nd and I realized it is one of the smaller races. We are going to take our chances because at this point changing fast passes and dining might be tough. A few years ago we were at HS in Jan when the marathon was going on. It was fun to see the runners but difficult to get around the park. I remember it not being overly crowded but I chalked that up to so many rides being closed at HS at that time.