I can book our ADR's starting tomorrow so I'm planning on Narcoossee or Artist Point as an alternate. I'm really hoping CG reopens by then because it's our first choice for our anniversary dinner.
I've heard if you book CG about an hour and a half before Wishes you will be finishing up and get to see the fireworks. Wishes is probably at 9 p.m. in September. If your kids can't stay up that late, then I would book it so that the sun goes down by the end of your dinner. I haven't eaten at CG but we stayed at Bay Lake Tower which basically has the same view, and the view of the castle and MK lit up at night is magical and shouldn't be missed. I looked up the sunset times for September and it is around 7:30 p.m., so I wouldn't book earlier than 6:30.