On days like these! takes a humorous but insightful look at special days. We begin by asking whether May 1st is a public holiday that’s really worthy of a celebration. Over the centuries, quite a lot has happened in the world on this particular day: it’s not only a celebration of the labour movement, it’s also Elvis’ wedding anniversary and Batman’s birthday. Painkillers, the Trabbi car and the Empire State Building also have reason to celebrate on this day. And what is it that makes May 1st the most dangerous day of the year?