I am very sorry you are having this problem, especially only a few weeks before your wedding. Anyone who has ever read my answers knows that I am not much of a fan of any of the light or energy-based devices, including IPL. At this juncture, I would consider the use of TCA peels in concentrations of 15-25% to help fade the remaining dark patches between the white stripes. If treatment is begun right away and repeated every ten days, there should be sufficient lightening of the darker areas by the fourth treatment session, not long before your wedding, to make the problem, if it still remains, more easily coverable with makeup. Best of luck and congratulations on your upcoming marriage.