The three things you need to know today in New York: Sun December 17

1. The coolest variation of Christmas caroling will be in Washington Square Park tonight. Unsilent Night is a massive parade of boomboxes synced up via smartphone. 

2. Attend Merry Tuba Christmas at Rockefeller Plaza tonight. The free event features hundreds of tuba players performing your favorite Christmas carols. 

3. Tonight there’s Harry Potter Movie Trivia at Videology in Brooklyn. The winning team gets free Butterbeer.

For more events, check in with Time Out throughout the day.