How long after breast augmentation can I wear a strapless wired bra?

hello thank you for your question and provided information as well;..based in your question its difficulted evaluate your case if the question dont have a picture, its recommended to get a consultation in personal with a plastic surgeon.

Every surgeon has his or her own rules.  I recommend 2 months after surgery.   I also recommend an in-office examination as well as a detailed discussion with a surgeon who you are comfortable with.   Finally, make sure your surgeon is a Double-Board Certified Plastic Surgeon certified by the American Board of Plastic Surgery (ABPS), a member of the American Society of Plastic Surgery (ASPS), a member of the American Society of Aesthetic Plastic Surgery (ASAPS), and a fellow of the American College of Surgeons (FACS).Best,Dr. DesaiBeverly Hills Institute for Aesthetic Plastic SurgeryHarvard Educated, Beverly Hills & Miami Beach TrainedDouble Board-Certified, Double Fellowship-Trained Beverly Hills Plastic Surgeon

It is not so much a question of how long after surgery you can wear a strapless bra, because my patients can wear a strapless wired bra or no bra at all anytime after surgery.  I use no post-op bras at all and leave it to the patient to choose. The main concern is how much swelling and how long the swelling of the upper breast takes to resolve before the wedding.  This varies tremendously between women depending on their pre-existing anatomy, tightness or lack of tightness of the breast/skin envelope, and implant size. Some women who have, for example, been pregnant and nursed may have a loose skin envelope, and when they have an implant that is not overly large, may look like they have not had surgery a couple of weeks later. On the other hand, if a woman has not had children, has a small cup size is and going up to a C, and particularly if she has a relatively short nipple to fold distance, she may have a very prominent upper pole with swelling that may take at least 2-3 months to settle. And then there is every one in between.  
In general,  the upper pole swelling goes down sufficiently in the "average" breast augmentation to go to an event as you mentioned in about three weeks.
The picture below is three weeks post op.