Go on and glow. Two days before your wedding (or one, if you're very confident with your tanning artist), get your bridal spray tan. You'll have time to touch up any minute errors and wash off all of the guide color.
Try an at-home brightening mask. If you're more of a multitasker, go for an overnight mask. But be sure that the formula is supergentle — you don't want to irritate your skin right before your nuptials!