It happens, and really there isn't much you can do to stop it. Wedding dresses these days leave armpits exposed, and after hours in a satin, silk, chiffon, or tulle dress...deodorant can wear off. Believe me, I know you don't want to read this. But I am going to offer you a secret that will get you through your entire wedding without a worry about the "scent of a woman".
In your little bag, carry baby wipes and a trial size deodorant. The baby wipes totally get rid of any stinkiness and the fresh deodorant will keep your hands up in the air to boogie the night away.