Halloween at Offshore Rooftop Celebrate Halloween at Chicago's largest rooftop with a night of music, costumes, and unforgettable skyline views. Join us Friday, October 30, for an elevated Halloween party featuring live DJs, high-energy dance music, curated cocktails, and one of the city's best crowds. Overlooking Lake Michigan and the Chicago skyline, Offshore Rooftop transforms into the ultimate Halloween party. This event features a live musical arts performance by a house/EDM DJ. 21+. ALL SALES FINAL. NO REFUNDS.