OK I e-mailed the park about the Fall family fun night and the Fairgrounds event being on the same night . Here is the e-mail I got in return ....
Dear Maryann,
The Fairgrounds event begins after the Season Pass Holder event ends. There will only be a minimal overlap between the two events.
Thank you
Alexandra Nicotra
Guest Relations Coordinator
Six Flags Great Adventure, Wild Safari & Hurricane Harbor
P.O. Box 120
Jackson, NJ 08527
SO I guess there will be both events ... Should be intresting clearing out the park and getting the other event started . I remember the days of CAD and the park being open to the GP and people not leaving it was always intresting to see .
Admin Edit: I removed Alexandra's direct phone extension