The year I was losing, honestly I was so thrilled with myself and felt SO marvelous that my desire to overindulge just wasn't there. I stayed on plan and lost weight throughout.
If you can bring some healthy foods, enough for everyone, then by all means go for it! A veggie platter is great for nibbling. A big salad. or 2. A fruit platter or baked apples for dessert. At social functions is when I head for the diet Coke.
You CAN do this. And believe me,you won't regret staying on plan. You will love the results and that wonderful feeling of self respect, self discipline, self control and accomplishment. Very gratifying. I have never, ever, not even once NOT eaten something I was tempted by and later regretted it. NEVER. There will ALWAYS be these foods around. There's no shortage of it. But for right now
if it's the weight you want OFF, then stay away. Another thing you can do is bank some calories. Shave off a little every day from your daily allotment and plan in a small splurge. If you go this route, have that splurge at the end, so you won't be tempted to go back for seconds.
As for your clothing. It sounds as if you have great taste and will do just fine in the stores. You might want to invest in an undergarment that will keep your tummy looking great. There's Spanx and then there's cheaper versions that you can find at Macys or even cheaper at Target. This can really pull an outfit together. You'll look great, I'm certain of it. You look fantastic and I'm sure you're going to floor everyone.