From the DVC page on the TOTWL:
"Parking is only available to those staying at Bay Lake Tower at Disney’s Contemporary Resort or Disney’s Contemporary Resort. Members traveling from other Resorts must use Walt Disney World Transportation.
Parking will also be available for Guests renting the Top of the World Lounge for the duration of the event."
We have usually gone to TOTW after eating at California Grill.
It sounds like you are supposed to use Disney Transportation or take a cab or Uber to get there.