TrickyDave, that was yesterday and now it's today. Concentrate on today.
I'm also attending a New Year's Eve party this evening that I wasn't looking very forward to attending because of temptations. My plan is to show up with a "Box o' Joe" from dunkin donuts to share with others that don't drink and to show the ones that are drinking that I am NOT drinking alcohol. If offered I will gracefully decline and if temptation gets to be too much, I will leave the event.
Whatever your plan turns out to be, You can do it!