Hey, howdy, hey Tzitziki and welcome to the Disney Parks Moms Panel.
You are absolutely right on both accounts. First, additional
FastPass+ selections may be made one-at-a-time on a rolling basis until the theme parks close or when there are no more available. Second, if you choose an evening experience, whether it is entertainment like a nighttime show such as
Rivers of Light or an attraction such as Peter Pan's Flight, then you will lock up your ability to make additional FastPass+ selections until you have used your initial three pre-scheduled selections. This is the main reason why we choose to use our initial FastPass+ selections between 10:00 AM and 1:00 PM. I know the crowds get larger as the morning hours tick away and that by not using them first thing in the morning we can take advantage of the shorter attraction lines. Then when the crowds are building we can use our FastPass+ selections.
Disney Dad Tip: A special nighttime experience to see fireworks or shows is a
dessert event. Happily Ever After fireworks spectacular is made even better for us by the delicious treats and beverages. We chose the
Fireworks Dessert Party with Plaza Garden Viewing because we wanted to be directly in front of Cinderella Castle. You may also choose a Dinner Package (at each theme park) such as the
Fantasmic! Dining Package with special seating for nighttime shows.
Tzitziki, enjoy making many Magical Memories.
~Jason