LAST SATURDAY, APRIL 2ND, WAS the best holiday you’ve never heard of: International Pillow Fight Day. It is exactly what it sounds like. All around the world, people gathered together to absolutely wail on one another with feather pillows. There were events in New York, in London, in Helsinki, in Washington, DC, in Taipei, in Amsterdam, in Toronto, and in many other cities, with everyone from small kids to grandmothers joining in on the pillow fight.