I use to celebrate May Day / Labours Day every year
In Germany it is an officially part of the holidays. Usually means no school, no university, no work (of course, the hospital staff, police and other workers still have to do their job). The "classic" May Day (at least as far as I know) is celebrated with wandering and having a good time. Yesterday, I met with around 25 very close and good friends in the morning (10 a.m.) and we wandered about five hours through the beautiful forests and small hills. We pulled to "toy wagons" with us, loaded with drinks, and in the afternoon we had a nice barbeque party in the garden of a friend.
It is usually one of these days you can really look foward to, especiallys since you often have the chance to reunite with friends or familiy members.