John Cusack hoisting a boombox over his head to profess his feelings for Ione Skye in 1989’s Say Anything is still an iconic pop-culture moment all these years later, as are images of break dancers in the ’80s walking the streets of New York with portable stereos on their shoulders. This Saturday, in Washington Square Park, you have an opportunity to dust off your own pre-digital music players and join the world’s biggest boombox parade conceived by composer Phil Kline. Kline will lead a musical chorus of boomboxes and sound-blasters through the streets of Manhattan to Tompkins Square Park all playing an arrangement of the holiday classic Silent Night. He’ll even pass out a few boomboxes from his own collection for the occasion. The event is free (here are the details), but if you can’t make it on Saturday, you have a second chance to hold a sound system over your head this winter because Kline is coming to Brooklyn on Dec. 21 to host a second boombox parade in Fort Greene.