We had a similar dress for my sister-in-law's wedding in coral

It shouldn't take too long to get it altered if you call around and make an appointment a few days before the date and tell them of your situation. Do you know of any friends or family that can do alterations? If so that would save you a lot of explaining. But yeah I turned my dress in a week or two before my wedding for maintenance stuff and it was back in like 3 days, and that was through David's Bridal lol