I can't remember who had this quote or a close paraphrase "I'm not Diabetic at Christmas or on my birthday"
If you are new to the game of D take it very easy, not too much alcohol, you are still experiencing new things and you don't want to get into a dangerous situation. Remember high over Christmas is much better than low. You still need to plan and be selective which parties you are going to party at. I limit myself to 3 over Christmas. I attend more, but the rest are diet coke or equivalent, I try not to eat that much etc. The big 3 - well, the night before I halve my basal insulin. During the day up to 3 hrs before the party I have more of the bolus insulin. If my alcohol to food ration gets out of whack which means it's not an open bar, but has free food, I may take another bolus, however if things are going to plan my Liver is way to occupied with the alcohol, to have any interest in dumping any glucose. I don't even try and control glucose levels as they will be bouncing all over the place and deliberately on the high side alcohol and low's do not mix, I frequently don't even take my meter or bolus pen. The hard part is giving yourself the basal when you get home. I have missed that a few times, that means I have a double hangover with DKA and a hangover, that is not fun.
I know if I had my time again during my honeymoon, I would have eaten every cake and sweet shop out. This could have drastically impacted my honeymoon period if I had done it (I only got about 8 weeks honeymoon), but it's something I can never do again, if I have a faux sugar binge (normally coming out of a hypo) . I really suffer.