Hi there Jeffrey, and welcome to planDisney!
It sounds like you're planning a fall-tastic getaway for this October. You'll be visiting Walt Disney World just as the
50th-anniversary celebration is getting underway. Be sure to stay tuned to the
Disney Parks Blog and
official social media accounts to keep up with all of the excitement!
If you're looking to visit
Disney's Hollywood Studios on October 26th, you'll need to have
theme park admission valid for that day and
Disney Park Pass reservations. I checked the
Availability Calendar, and as of right now, all theme parks are still accepting reservations for October 26th, so you're good to go!
Unfortunately,
Disney After Hours Boo Bash is sold out for October 25th. Tickets are still available for Sunday, October 24th, so if you can tweak your dates just a tad, you'll be able to experience this frightfully fun event. This is only one of two October dates for which tickets are still being sold, so if this is a must-do for your family, I recommend securing tickets as soon as possible for the 24th.
I hope this is helpful, Jeffrey, and that you have a boo-tiful visit to Walt Disney World this fall. Thanks so much for stopping by planDisney en route to adventure, and we'll see ya real soon!
Betsy