The interactive entertainment piece, created by the British company Punchdrunk, is loosely inspired by Shakespeare's Macbeth.
"We like to do a masked ball every year, and this just dials it up so many notches," Gossip Girl executive producer Josh Safran told EW.com. "We were very much attuned to keep Sleep No More's secrets. At the same time, they were also really helpful in letting us utilize stuff that they maybe normally wouldn't. We shot there for two days -- several of the rooms, different floors."
Gossip Girl revolves around a group of young rich people on Manhattan's Upper East Side. The series stars Blake Lively, Leighton Meester, Chace Crawford, Penn Badgley, and Ed Westwick.