The Ace Hotel continues its tradition of awesome (free!) events with this NOLA-style Mardi Gras masquerade ball at Upstairs. Revelers will find the rooftop lounge decked out in full parade regalia, complete with fortune-tellers, rogues, DJs spinning all night and Cajun food perfect for indulging in on Fat Tuesday. Entry is free, just RSVP online ahead of time. Then head downtown, and let the bon temps roll.