The 9pm show will end shortly before the fireworks start at 9:25. A lot of people will stay in their seats and watch the fireworks from there. The area will clear out when the fireworks are over. I think they last about 18 minutes. There will be a huge rush of people from the hub, trying to get seats for the 2nd showing of F!. I recomend that you are over near the haunted mansion/ splash mt area prior to the fireworks ending so that you can get in and get a spot without getting stuck in the herd of people.