SeaWorld is open later on Summer Spectacular
event nights — and most of the roller coasters remain open as well (weather permitting). The SeaWorld Summer Spectacular extras are included with normal park admission.
Event night highlights include a DJ over at Bayside Stadium that plays high-energy dance music in a fairly large open space called "Club Sea Glow". There are cast member dancers that encourage guest to dance along with atmospheric acts (like light twirlers and stilt walkers) to help keep the party energy going. The Summer Spectacular event nights conclude with a firework display. You can see the "Ignite Fireworks" from just about anywhere around the big lake in the south end of the park.
The event usually takes place on Fridays, Saturdays and Sundays throughout the event period — but can also include weekdays over the busy summer months. Please check the official SeaWorld website for specific dates and times of the Summer Spectacular event