Hi Denise,
I love hoarding Disney Gift Cards! In fact, I usually buy one when I'm at the supermarket and keep it for my next Disney visit. Don't tell my husband; he thinks it's groceries:) They can be used for pretty much anything at Walt Disney World and online at The Disney Store. You can even book a Disney cruise with them!
Mickey's Not So Scary Halloween Party is SO MUCH FUN! You can use your gift cards to pay for the special ticketed event. You can purchase your tickets online
here. Just use the gift card (s) as you would any credit card. The same goes for ordering your tickets by phone. You can give the Disney Representative your card number and they'll process it the same as a credit card.
If you have multiple Disney Gift Cards you can combine them into one card when you visit the
Disney Gift Card website. It's under "Manage Cards" then "Transfer Balance". The maximum you can have on one card is $1,000.
I hope this helps, Denise. Wishing you a SPOOKTACULAR time at Mickey's Not So Scary Halloween Party!