shower or pool is my first choice, but the dress will survive it very well for more later, personally love to see that dress wet. As for its destruction, getting a 'wedding' cake and smashing it onto the dress. some type of drink at the wedding as well, maybe red wine?
what is the dress? looks gorgeous I wouldn't mind having one myself
I would be happy to have you as my bridesmaid in that dress and we could have some messy bridal fun where both of our dresses gets ruined and destroyed completely with cakes whipped cream chocolate syrup oil and finally ripped to shreds xx