Marquee Dayclub

Marquee Dayclub is the Cosmopolitan's rooftop party deck — 22,000 square feet, two pools plus a private infinity pool, bars, a gaming area, and, since the spring 2026 renovation, a redesigned stage that puts the DJ nearly on top of the crowd with an all-new sound system behind it. Martin Garrix headlined the grand reopening on March 21, 2026.

What no other Strip dayclub offers: it never closes. Summer runs Thursday through Monday, 11am to 6pm, with the Drenched After Dark pool party taking Sunday nights; come winter the deck disappears under the Dayclub Dome — 23,000 square feet, 50 feet tall, air held at 85 degrees and water at 90 — and the party keeps going Friday through Sunday while every rival is shuttered. The 2026 calendar stacks Fisher, Chris Lake, and The Chainsmokers, with Beatport Fridays running a curated house-and-techno residency May through early September.

Quirks to know: the entrance is on the second floor through the restaurant level and confuses everyone, daybeds hold a $1,500 floor even midweek, and cameras (GoPros included) are banned. GA itself is friendly — among the cheapest of the big dayclubs — and the ladies guest list runs free.