I've never been to a charity gala before, but I vaguely remember hearing (maybe it was on a movie or something?) that you shouldn't wear something flashy to a charity event because the focus should be on the cause, not trying to draw attention to yourself.
Super cute however some charity galas that I've gone to generally have people in less flashy dresses. Most girls/ladies wear a black dress or something more simplier than the dress you want. Unless you're going to a gala where people dress up like the girls in gossip girl then I'd say go for it! Good luck :)
CUute dress! ...but yeah maybe 2 flashy 4 a charity gala. otherwise,..hot dress, I'd totally wear something like that.