Hi Amelia,
Typically, there are fireworks most nights at the Magic Kingdom (MK). There are a few nights here & there when the fireworks are not held. There are also some evenings when MK closes early & reopens later in the evening for special ticketed events (i.e., Mickey's Not-So-Scary Halloween Party & Mickey's Very Merry Christmas Party). While there are usually fireworks held these evenings, only those Guests with special event tickets will be allowed to view them from within the MK.
Illuminations at Epcot is usually held every evening - again there may be some exceptions. There are no fireworks at Animal Kingdom.
Fantasmic! at Disney's Hollywood Studios is only performed on select evenings. Because of this, the theater fills up fast so you should plan to arrive at least 60-90 minutes prior to show time.
You can check parade & fireworks schedules for all 4 of the theme parks online by clicking on these links:
Magic Kingdom
Disney's Hollywood Studios
Disney's Animal Kingdom
Epcot
Select a month from the drop down list next to the
View Month tab. That will take you to the calendar for that month which will list park hours & Extra Magic Hours. Click on a specific day for parade & fireworks schedules. Be sure you pick up a Times Guide as you enter the parks to confirm as schedules are always subject to change without notice.
If you'd like me to check any specific dates for any of the parks, let me know & I'll be happy to do that for you. Wishing you many magical memories :-) Allison