My bad, forgot to copy that from Deb's site too.
Here it is.
Can anyone purchase a ticket to Magic Kingdom E-Ride Nights ?
Disney Resort Guests, Hotel Plaza Blvd. Guests, Swan, Dolphin and Shades of Green Guests with multi-day passes can purchase a ticket for an after-hours party in the Magic Kingdom Park.
Offer good only for Disney Resort Guests with the following multi-day tickets: Ultimate Park Hopper, Park Hopper Plus, Park Hopper, Seasonal Pass, Annual Pass, Premium Annual Pass. You must have used your pass on the day of the event in order to gain entry.