Six Flags Great Adventure (SFGAdv) Discussion Thread in Theme Parks, Roller Coasters, & Donkeys! Posted October 30, 2015 I'm confused if the park is open just for passholders. It kinda sounds like it the way its worded but would seem silly (albeit awesome for us nerds) for them to be open for three whole days just for passholders. Also Sat and Sun are the Grape Adventure Wine fest thing so that'll be going on too. well looking at the sf website under hours, its doesn't specifically say sph only.