I am sure she flies more nights than not, but as I've read on some other threads lately, it is a shame when an expectation has been set that then for some reason is not met on a trip that is "tarnishes" the trip a bit!
I also believe that weather can be an issue, but I can't say for sure when and when not the fireworks might be cancelled due to weather or Tink might not fly. I have not had the occasion to be at the fireworks during bad weather!!!!
I know I was mildly disappointed that night, as we don't often stay for the fireworks, and I had purposely gotten a great spot directly under her flight path for a photo op!!! Tink was naughty fairy that night!