May day
May 1st is the international labor day, which means that it's celebrated as such everywhere except in the US. In the US the Labor Day is celebrated on the first Monday of September. In the communist countries May 1st was probably consider THE holiday, as these regimes were based on the idea that they owed their very existence to the overcoming of labor oppression. In reality, it was just yet another excuse for laborers not to work. The avoidance of work in communist countries became a veritable art form, which to anyone with a bare modicum of intelligence comes as no surprise: if all labor is valued more or less equally, what incentive does anyone have to work more than anyone else? And herein lays probably the simplest explanation for why communism collapsed: it collapsed because it didn't work.