Can I go braless for two nights 2 weeks post op? (photo)

Congratulations on having undergone the breast augmentation procedure;  it is best to follow your plastic surgeon's "protocol" given that your plastic surgeon knows exactly what was done, how you are progressing, and what works best when it comes to achieving patient pleasing outcomes in his/her practice.  
 In my practice, patients wake up with a surgical bra in place. This surgical bra, although not attractive, is supportive and used for about one month after surgery (some of my patients have been known to burn the bra ASAP). Then, patients transition to a soft sports bra. Wired bras are used when breast have reached their “final position” and patients have full sensation along the breast skin. 
Generally, the longer I have been in practice, the more I appreciate the long term use of supportive bras after all types of breast surgery.  This additional support may be especially helpful when patients are lying down and/or engaged in strenuous exercise. Best wishes for an outcome that you will be very pleased with.

and that you don't forget that your breasts are still recovering from surgery and don't do anything that could lead to a bleed.  I hope you've checked with your surgeon prior to your departure and will comply with the recommendations.  If your dress doesn't pull down excessively on your mounds, you should be okay but I worry more about what could happen as the evening progresses and you lose your inhibitions from celebrating a little too much.  Bleeding is a real drag so don't overdo it!

I recommend contacting your surgeon. It is a simple question we get all the time. In my practice, as long as your taking it easy, a couple hours out of a bra usually is harmless, but check with your doctor to be sure! Enjoy your trip!