These did stay on with lots of dancing and head shaking and I didn't think they were heavy at all (I mean how can a clip on be too heavy?!)! (renttherunway.com)
Real dancing stars: Not a whole lot of dance performances involve screaming fans, but this one might. (mysanantonio.com)
I think that you made the right move in going for a low gold heel, especially since there'd be lots of dancing at the wedding! (ablondesmoment.com)