Hi Tomiko,
In order to access this information, you will need to check the Park Calendars on the Walt Disney World website. Here are the links to each of them:-
Magic Kingdom
Epcot
Disney's Hollywood Studios
Disney's Animal Kingdom
Once you are on the Park Calendar page, you will need to click on the drop down box located next to the current month and select September.
The September calendar for the park of your choice will now be displayed. From here, click onto 1 September 2011 and you will be able to see the times for all parades, shows and fireworks which are scheduled to take place on that day as well as any extra magic hours on offer.
To check for the other dates of your visit simply keep clicking on 'Next Day'
For example, you can see this information for the Magic Kingdom on 1 September 2011
HERE
Wishing you a magical trip!