The only large social gathering I attended during my first two years of sobriety was an AA convention. I couldn't do a wedding when I was two or three months sober, and if I were to go to an all-inclusive resort for a week or more in that time frame, I would be going so that I could drink night and day. Accepting this reality is what helped me to remain sober. So I can't really offer you advice as to how you might prepare in order to stay safe.