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Hmmm for entertainment I recommend:
The Dapper Dans
The pianist at coke corner
The Swing band on a Friday Night in Carnation Gardens
Do not mis Billy Hill and the Hill Billies in the Golden Horseshoe
New Orleans Square
Check out the Dixieland band in NOS at the French Market, also the various streetmousphere in this section
Fantasmic is a given. The last show of the night is the quietest or you can buy a dessert buffet with reserved seating.
Best viewing for the fireworks is by Coke corner on Main Street or over in front of It's a small World where they also use projections.
Be sure to see a band at Tomorrowland in the evening, and if you are a star wars fan, Jedi academy is really cute.
Over in DCA, there is not quite as much entertainment anymore except for the excellent Aladdin show in the Hyperion, the mariachi band near the Tortilla Factory and World of Colour (you can get a dinner deal that will reserve a place for you).
Parks are likely to be open till midnight (or later - when I was a kid, it used to be 2am, but they cut back a few years ago).