September 3 is not a date for
MNSSHP, so you're good to watch fireworks (regular HEA, not the special Halloween show) inside the park.
If you were there on a night when MNSSHP is scheduled, you'd have to leave at 7:00. Anyone with a tickets gets a bracelet to wear. CMs make sure anyone without a bracelet leaves the park. Our favorite place to watch fireworks outside MK is from the boat launch area at the GF. Not the same as being in the park for sure, but it's a nice view (and not nearly as crowded as park viewing)!