1975 : Beer Salesmen Prohibited From Buying A Round of Drinks for Everyone at Bar Calendar Add to Calendar Add to Timely Calendar Add to Google Add to Outlook Add to Apple Calendar Add to other calendar Export to XML When: May 1, 2020 all-day Repeats 2020-05-01T00:00:00-04:00 2020-05-02T00:00:00-04:00 On May 1, 1975, a new state law prohibited beer salesmen from buying rounds for the house at bars and, instead, allowed them to buy a single beer of the salesman’s company’s brand for one person. Source: Mich-Again’s Day.