Hi Amanda,
Super cool that you are planning ahead!
Disney usually posts the online calendars for the theme parks about 6 months in advance so right now they have through September 2011 posted. I would hope that we'll see October's calendar posted by the beginning of April. For now I can help you with the September 2011 dates for Wishes & Fantasmic!
Here is what the current online calendar shows for Wishes at the Magic Kingdom during the September dates of your stay:
9-26-11: 9 p.m.
9-27-11: Not scheduled / park closes at 7 p.m.
9-28-11: 9 p.m.
9-29-11: 9 p.m.
9-30-11: Not scheduled / park closes at 7 p.m.
As of right now, the online calendar only shows Fantasmic! at Disney's Hollywood Studios scheduled to be preformed on 9-29-11 at 8:30 p.m.
You can keep an eye on park hours (including Extra Magic Hours), parade & fireworks schedules for all 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. From there, click on a specific day for parade & fireworks schedules. Be sure to pick up a Times Guide as you enter the parks to confirm as schedules are always subject to change without notice.
Hopefully the October calendar will be up soon. You are also welcome to check back with me at the beginning of April to see if we have more of an update for the October calendars.
Wishing you many magical memories :-) Allison