Labour Day is one of the few fixed-date holidays in the Austrian calendar. It always falls on 1 May and therefore feels very different depending on the weekday: sometimes an automatic long weekend, sometimes a classic bridge day, and sometimes a barely noticeable weekend holiday.
In terms of meaning, the day has two layers. In cities, International Workers' Day with rallies, trade unions and political tradition often comes first. In many municipalities, maypoles, associations, music, spring festivals and outings shape 1 May instead.
For 1 May, first check whether you have the day off, which shops are closed, where May festivals take place and whether a leave day is worth it. Once that is clear, history, customs and offers are easier to place.