They do a sweep of the park starting before 5 pm and they will clear out all people that are not in a holding area. From around 4:30pm they start with blocking pathways to funnel you either into the the last train ride, or gently push all to the exit at the front of park. You will not see anything related to
HHN, as close is 5pm and HHN starts at 6:30pm. Hence, you will be far away from the Studios by the time they bring out, and uncover the HHN props and actors.
Know that even though the Studios is closed at 5, Islands stays open until 7, 8 or even 9 o’clock. Just check the calendar.
I only do one night of HHN, so in the nights HHN is, that I am not attending, I transfer over to Islands by around 4, otherwise I made the mistake to do it later than 4 and it was crazy crowded, as I was not the only one thinking, oh I will ride the train at the last minute. Otherwise, I work my way toward the exit, doing ET, and exit, then I find something to eat in City Walk before having some fun in Islands.
Know there is also a steady stream of people wanting to go to HHN starting to make later in the afternoon a bit more crowded inside the park, and many head to the Studios crowding City Walk as they come from the parking garages.
I hope your family will enjoy your time in the parks.