Bruno Mars New Year's Eve at The Chelsea Tickets starting from $150 Doors: 9:00 PM All Ages Show No refunds or exchanges. For VIP table reservations please email: NightlifeMarketing@cosmopolitanlasvegas.com or call 702.698.6797. Guests must be 21+ to reserve a table. Grammy-Award winning recording artist and critically-acclaimed performer Bruno Mars will make a triumphant return to The Chelsea at The Cosmopolitan of Las Vegas for an unforgettable New Year's Eve performance on Dec. 31, 2015. For one night only, Mars will once again ring in the New Year at one of the hottest spots in the nation with a show-stopping evening featuring his eight-piece band, The Hooligans. Keeping true to its reputation for bringing world-class performers to its intimate venues, The Cosmopolitan will mesmerize guest inside The Chelsea. The intimate setting at The Chelsea combined with Mars raw talent will create an unparalleled New Year's Eve celebration.