The Gramercy Park Hotel shut 200 guests out of their rooms on New Year’s Eve after the computer system for its electronic key cards failed. Guests at the hotel, where rooms cost up to $2,000 a night, were locked out of rooms from midnight Dec. 31 until 7 a.m. on Jan 1. “Kids and grandmothers were sleeping in hallways,” one guest told us, adding all remained calm. During the lockout, the hotel’s Terrace Bar and Rose Bar, haunts for the likes of Jim Carrey and Gerard Butler, threw splashy bashes, where guests paid up to $1,000. General manager Elizabeth Mao blamed a “glitch in the system” and said staffers had to painstakingly reprogram each key individually to open doors. The hotel has offered future stays and rebates. They also let guests into Rose Bar’s party for free, if they were still in the mood to celebrate.