Yup I agree, you will be so busy socialising with all your guests and your guests with each other that I reckon people won't even notice! Take a drink/top up when it's offered and then float on to the next group, table etc. If you constantly or regularly have a drink in your hand, people just assume you're drinking from it. Get your DH to be to help you out too by deflecting discussions if they move in that area. You can also try drinking water for a while and telling people that you just downed 2 (or three or whatever!!) glasses quite quickly and it's gone to your head so you're having a water before your next drink.

GL hun and enjoy your big day!