Some great advice above. The advice you didn't want to hear, alas, is the right advice.
Is your long term health and sobriety more important than someone else's wedding? If yes, don't go. If not....believe it or not, we understand. We were all new to this once. It's frustrating watching your plan unfold (a glass of wine in front of you? old drinking pals? two days sober?), and that's why you're getting seeing some red lights and stop signs here on the board from me and a couple others. I suppose I would compare it to listening to a college student promise to study for a make-or-break final exam...only to watch them walk out the door at 2am to hit the bar just hours before their test. It's hard to watch, but at the same time we've all been that kid. You live and you learn. I hope you don't go to the reception, but if you do I hope that you can learn something from this experience. We support you in your quest for sobriety and we all want you to pull through! Good luck.