Hi Judy!
Thank you for sending in your question to the Walt Disney World Moms Panel. Unfortunately, it is too early to check on the times for Fantasmic for October. Show times and park hours are generally not released until about six months before, so you will have to check back later in the year. However, I'll tell you how to find out once they are posted.
To find out when any of the nighttime spectaculars in Walt Disney World will be showing, you just need to look at the park calendars. To see them, go to the
main Walt Disney World website. Then at the top of that page, click on Parks and then the park you are interested in; so in this case, click on Disney's Hollywood Studios. Then when you go to the main Hollywood Studios page, you can click on calendar on the left side of the page. Then go to the month you are interested in. Then click on each day to see what major events are planned for that day.
I hope this helps! Write back with more questions!