So what you don't know anyone other than your hubby at all these events this weekend. You WILL be fine. You have suitable clothing (hopefully!) and have nothing to feel self conscious about. Just get over yourself and have a good time. You are NORMAL and have been for some time, you are stressing out over nothing.
How about taking some pics? You have very few of you and your hubby and both of you will be dressed up. Step 1 - get your camera and pack it. And, should you forget to do this cause you are an idiot, you have a frickin' phone. So NO excuses!
Go back and look at some pics. Take your own advice and look at how far you have come. Get going. And yes, you have eaten more crap than you normally do this week and will again this weekend. Big deal! It's life and it's the holidays. It's been reasonable. Again, get over yourself. In fact, according to your Polar you worked out 6 hours, 6 minutes for 3336 calories---you got in some bonus time and not because you felt like you "had to", but just cause you felt like it!
So, to recap, take a deep breath, finish getting packed up, relax and have a good time. And, one more thing - Get Over Yourself!