I took 2 mg of Ativan (lorazepam) yesterday at 7 p.m. I wanted to drink a few alcohol tomorrow at around 2 p.m. Would the Ativan (lorazepam) have worn off by then?

Most likely. since the half-life is about 12 hrs and at least three half-lives have past by then you should be OK as long as you have normal liver and kidney function.