I’d like to get the pink dress I am wearing in a wedding dyed black to wear to a formal wedding the following week. Does anyone know what places may offer this service? I already thought about doing it myslef and decided against it; it is a rather expensive formal gown.
dying a dress ?
Just shoot it! Sorry couldn’t resist 
Sorry to put a (potential) damper on things, but as someone who knows something about dyes, this may not be a great idea.
Different fabrics accept dye differently, and may require different dyes altogether. For instance, fiber reactive dyes work well on natural fibers-cotton, rayon, silk, linen-and have the advantage of setting in cold water. However, true black is difficult to achieve. Also, fiber reactive black will not yield black on silk. Silk requires a black silk dye, which will need to be steamed to set. There are pigment dyes that will work on polyester and other synthetics/sythetic blends, but the fabric must be free of any coatings or treatments (stain releasers, wrinkle reducers and other make-the-clothes-look-good-on-the-rack treatments are almost universal) or the dye won’t set. Yet another possible difficulty-clothing made of natural fiber (eg. cotton, rayon) is often sewn with polyester thread (because it lasts longer); in such cases, the thread will not dye up the same as the fabric.
I’m echoing robinh’s words: unless the dress is entirely made from natural materials (including thread used in seams, decorations, zippers, etc.), the chances of the dye taking hold properly are very slim to none. Best case, the main fabric of the dress takes the color properly and the parts that don’t aren’t visible unless you’re looking closely. Worst case, you have a dress that looks like a failed attempt at tye-dyeing and attempting to re-dye the dress will only make it look worse. Also, you’ll be out a dress. It won’t really matter if you try to get it dyed black or just a deeper shade of pink: you’ll run into the same problems either way. Even if the dress is entirely all-natural, it’s very hard to get clothing that’s already made into something dyed properly. It’s much easier to dye the fabric before you make it into something.
I’d reccomend finding another dress, either buying one or renting it. (TJ Maxx, here we come!)
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One shouldn’t wear black or red to a wedding, and not pure white unless one is the bride, but pink is fine. Why do you want to make your dress black?
I thank you all for your advice, no matter that it wasn’t quite what I wanted to hear. 
I guess I’ll have to loosen the purse strings a get another dress.
To answer the question of why I am wearing black to wedding: the bride requested it. She is having a very formal wedding and dress is black tuxes for the guys, black dresses for the gals. I know it;s really odd; I’ve never heard of it before, but I have to go; it is my fiance’s little sister.
Thanks again for the advice!