Being the Maid of Honor is a pain. You are stuck in the midst of a lot of grunt work and forced to observe a lot of people's behavior as you back up your friend.
But LemonGirl, you are observing some important things. How much you are growing. You can delegate some water pail safety and tins for the smokers. 200 people = not all on you.
Don't forget that a lot of people go to baseball games and watch the Super Bowl and don't drink. No one ever 'makes' me drink at such events. Actually the last time my RAH and I went to wine country, I didn't drink either! He took me out on his motorcycle to scout a run route! Our wine country is really hilly and I started laughing hysterically the route was SO steep and hilly. We did stop at a dive bar and no one kicked us out for ordering iced tea with our food order.
I hope things go well and safely! Peace!