Go to an AA meeting on Friday night. It's a wonderful alternative to drinking. If AA is not your thing, spend three hours here. You will be around people who understand. In addition, we will be interested in how you are doing on the "big night."
That next trigger may be on Friday or some other time. I wouldn't wait and worry about it. Just be sensitive to your inner environment and seek out support when you need it.
I think at four days, you should stay in contact on a daily basis. It will help create a sober "groove" that will become more of your life. Drinking will eventually be little more than a thought that crosses your mind.