Just don't drink tonight. If you are like me, I would take it too far and then feel like crap in the morning. When you drink what usually happens? Maybe make a list of the reasons why you want to stay sober, like a pros and cons list.
Someone posted here the other day, something like, how many times have we woke uo hungover and regretted it but nobody has ever woke up sober and thought, I wished I would have drank last night.
I'm sure I butchered that. Stay strong, you can do this!!