I usually tell people they don;t need to go, but man honestly...I don't remember my brothers, or my sisters weddings. At all.
I really regret that.
Think about strategies before you go...and have an escape plan...it's better to leave early than stay late and make a mess of yourself.
There are some great tips here too (ignore the title - the tips are good for any social occasion)
Crying Out Now: Thanksgiving Survival Guide
Your addiction may have it in your mind to drink but there's no need for you to join that conga line.
You;re responsible for everything you put in your mouth. Look at the event as a few hours...challenging maybe but still only a few hours.
The day will be just another in those 67 - 68 days. There's no need to stumble if you come prepared.
D