I'm going off of my bad memory with prices and hours, but...
MNSSHP was a longer (and better? and cheaper?) than Boo Bash. Boo Bash was strictly an "after hours" event so the event didn't start till late (10pm?). For MNSSHP they closed the park early so we had access to the Halloween festivities from roughly 6-midnight. I think the consensus is, everyone hopes MNSSHP returns and that the Boo Bash was kind of a one and done thing, that only "had" to exist how it did because of Covid precautions/uncertain-ability, etc.
I'm sure someone will chime in with more accurate info, but this gives you the gist.