SFoG in September

I'm planning to go to SFoG in Sept and noticed they close again at 10:00 on Saturdays (up from 8:00 closure in August). Is this for the Halloween stuff they do? And if so, will all the rides be running?

All the rides should be running.

Fright Fest does not start till late September, maybe early October. (not quite sure). I have no idea why they open till later in September, but they do. If you go on a friday during Fright Fest I believe they are open till 11.