I don't have a refernce on hand but last I checked eating bread and crap like that doesn't keep you from getting drunk faster. It may ease your stomach and keep you from becoming dehydrated as fast but have no doubt in your mind that the alcohol will get into your bloodstream at about the same rate whether you eat or not. You will still be as drunk, but you will feel a lot better eating.
On another note I find that the worst thing about drinking is that if you get trashed, you are probably pretty likely to eat lots of shitty food. Then if you get hungover it can cost you a day of workouts. No one night of drinking will kill progress but if we are talking once a week and can really slow you down as far as cutting fat goes. If your trying to put on muscle once a week of getting a good buzz probably wont slow you down unless your drinking starts to completely fuck up your eating and gym scheduel.
There is a fun artical on drinking the working out studies and the lack of really extensive studies on the subject here. It came out back in September I think. Search for it.