One Free Bottle of wine at Sub 51. SUB 51 is a signature bottle service lounge, situated on the lower level of River North's Hub 51. Designed for deejays, the lounge offers a high energy, late-night atmosphere, amplified by music from renowned deejays. The intimate, 13-table lounge features low tables, plush banquette seating, attentive table side service, and premium beverage options. This club is an ideal destination for your special occasion, or just a memorable, high-style, weekend evening in Chicago. Space is limited so table reservations are required for entry.