If you go to www.allearsnet.com, and click on theme parks, I believe you will be able to view park hours and on the left side of the page are links to the parades, etc., and some of them list the times. This is a wonderful site with lots of information!
September is a great month to go because of low crowds. Just remember that it is still hot in Florida in Sept drink lots of water and be prepard for the occasional hurricane that tend to visit in Sept also. They are not a welcomed guest
You can also find the park/fireworks/parade hours on DIS site in Home page under park hours (left of the screen).
Sept is great; no lines but still very hot.
Hoping for more tips for September that is our trip time too. Oh and don't forget about the food and wine festival...bookings begin July 31st at 7:30 am I think!