I think you'll be too rush having 5 dresses... Cuz you're gonna spend atleast 10-15mins (or even more) to change each time, cuz you might need to change the jewelleries, touch up on make up or even change a little on the hair style.
On that night, you might wanna spare a little time actually to eat something...
I've seen friends starving for the night, cuz they don't have time to eat  |