Hi Krishanda,
Walt Disney World in October is super fun! I love being at Epcot for the International Food & Wine Festival and attending Mickey's Not So Scary Halloween Party.
While I am not sure if there is a separate villains party planned this year, there are some key places to find villains. In Disney's Hollywood Studios under Mickey's sorcerer hat, villains like to gather here. You can also find them throughout the countries in Epcot as well.
They are in Magic Kingdom in as well tucked in corners so not to "scare" the guests.
If you go to Mickey's Not So Scary Halloween Party, they will be out here as well.
I recommend you follow the
Disney Parks Blog to see if there are any special villain events while you are in town.
Wishing you a magical vacation!
Beth