You're right to be concerned. You're going to spend a holiday that is widely known as an excuse to get rip roaring drunk with people in your life who like to tell you that you don't have a problem. That's just a bit scary.
I understand that this is a big holiday. Have an exit strategy and use it.
No need for a reply on this but you need to be honest with yourself. Do you see yourself as getting away from this unscathed?