I would like to know about Illuminations also. I saw someplace that the MK parade viewing area is in front of the castle on the hub. Not sure about the other parks and shows.
Another question I have, is it worth using a FP+ selection for Fantasmic and Illuminations? The afternoon MK parade may be worth it depending on the time of year going. Like us, we are going in July. If you get to show up closer to parade time and still have a good view of the parade, it would be worth it not to be sitting out in the hot sun for an hour before. But, if the viewing area isn't all that great then it may not be worth it.