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Ahem.... getting back to the original question...

Grounds, as you're describing and asking them, would be anywhere on school property where they're having a class or organized after-school activity. i.e., I would often use a portion of one of our parking lots for my engineering class, when they needed more concrete than a sidewalk provided for one of their projects. In that case.. a CHL walking up to where we were to see what we were doing would be in violation of the law, as I understand it. IANAL, and like another has suggested, it's always up to the discretion of the law officer and the prosecutor whether they're going to charge you with something.

So, with that understood, here are my answers for your questions:
#1 - a CHL carrying in his car and/or parking lot on school property. No, as long as you did not enter the stadium, my reading of the law suggests that you would not be in violation of the law, since you were not in the physical premises of a school or educational institution, or any grounds or building in which an activity is being conducted. The stadium would be such a premises, and would be out-of-bounds.

#2 - a CHL watching a non school-sponsored game on on a practice field on school property, and the CHL watching from a "private walkway on the school property". I don't know how that could happen, since the walkways on school property would be owned by the school district. And yes, if you were at the practice field and it was a school sponsored team, then you would be in violation as I read the law.

#3 - a CHL watching a non-school sponsored football...err... soccer game (sorry, it's what my wife "learned me" to call the game we Yanks know as soccer) game on a college campus, and observed the game from a private walkway. Again, I'm not sure how the walkways in between soccer fields can be "private", but .... if you're on the college campus property, then you should be OK, since the activity was not school sponsored and you are not inside a premises (i.e. a building or portion of a building).

Again, IANAL and YMMV. Ad infinitum.