I work in
PR therefore I have a really busy social life, plus my friends and family are all major foodies so I'm constantly surrounded by food. My advice would be: check the menu to see if there's anything you can eat, like for example if the chicken comes in a cream sauce ask them to give it to you plain. Also ignore the fries or potatoes and ask for extra veggies or salad instead.
Ignore starters, fill up on veggies during the main and then while everyone else has dessert order a mint tea or a coffee and add some stevia or sweetener to it. That's what I do.
It's hard at the beginning, the first time I went out for a party after I went paleo I was pissed off at not being able to eat or drink anything. Now when I look back, and I've seen the changes this new lifestyle has brought with it, I think "Yes, I did it and I can do it!" Good luck hun xx