PHILADELPHIA (CBS) —  The annual Philly Pillow Fight returns for its 4th annual year.

Hundreds Celebrate ‘International Pillow Fight Day’ In Washington Square Park

Massive pillow fights are being held around the world Saturday, including in Philadelphia.

The event has been organized on Facebook in previous years and continues to rally lots of people to bring their pillows and have at it.

Whoops! Denver Post Uses Citizens Bank Park Photo In Its Coors Field Visitors Guide

Hundreds of men, women, and children will gather in Washington Square Park between 3:00 p.m. and 6:00 p.m. to pelt each other with pillows.

At the end of the event, organizers will collect the pillows which will then be laundered by Got Laundry and then donated to the homeless.

The event is free.