not that crowded
it's actually not that crowded.
Most holidays that are one day holidays are not that busy when school is in.
You figure that most kids only get out of school for the one day and if they're from far away they're not traveling that far just for one day of vacation.
It is not that busy and I will be there at that time myself. It will be more crowded than normal because people within a few hours of the park will take that time to go because of the extra day off of work but, honestly, I would not get too up tight about it.
Best case scenario is they'll extend park hours (as I laugh).