An alcoholic is someone who can't have "just one" drink.
Binge drinking is a form of that.
My XABF would generally have a single shot of whiskey in the morning, and nothing on weekends.
Then it turned into a shot in the morning, a lot to drink on Mondays, tapering down through the week until he hit no drinks over the weekend.
Then a shot in the morning, whatever he could get his hands on Mondays and Thursdays, tapering down until the next giant drinking day.
Then it turned into a shot in the morning, a pint after work in about a half-hour span, finishing off whatever he had readily available once he was good and drunk from that pint, and then trying to taper down over the weekend just to start the whole process over again come Monday.
Then it didn't matter what day of the week it was.
Other alcoholics have an easier time keeping to some sort of schedule, because that's "how they do it". My XABF's father (who died years before I met XABF) was a weekend binge drinker (when he wasn't playing golf), who had 2 beers each evening watching his favorite television programs. He'd also binge on holidays, but he was never drunk for work.