International Pillow Fight Day

GLOBE PICK: Saturday is International Pillow Fight Day, which means there will be a fluffy brawl in Copley Square.

Other participating cities include Beijing, London, Stockholm, and Székesfehérvár (that's in Hungary). The rules are simple: bring your own pillow (a soft one is best), don't hit people who don't have pillows, don't hit people with cameras, and take off your glasses. Best to arrive at 1:55 p.m., the air horn commencing the fight sounds at 2.