Metallica Fan, that red dress is gorgeous, and I think it would be an excellent choice for a wedding. You will look smashing in it. What kind of shoes and accessories will you wear?
As for black, at least in my community, I think the only time you even need to think twice about black for a wedding would be for something like a woman's business suit or severe dress that looks like you are dressed for a solemn funeral. Any black party outfit or LBD is fine, especially at night. For daytime, I'd probably go with a colored accessory or two with a LBD, but for any occasion, not only weddings, just because that makes it less evening-y.