Been sober for a month

Hi everyone, I used to drink like twice or thrice a week and every time I drank, I used to finish around 500ml of alcohol until I pass out. My tolerance grew to a level that I needed 3-4 drinks to feel anything or had to chug a couple of drinks.

Tomorrow I have a date and will be drinking after a month. What can I expect after this break and how should I go about it?