Today is May Day, also known as International Workers' Day, Día del Trabajador, That Holiday in May, etc. So it makes perfect sense that Argentina's main labor group, the CGT (Confederación General del Trabajo), held its big downtown event, which blocks all traffic through the center, the day before the holiday. Because you wouldn't want to waste the holiday, you know, celebrating the holiday at some obligatory union event. Better to save that day itself for fun, and mess up everyone else's commute the day before. (And, hey, who's against a four day weekend anyway?)

(Photo: Clarín)