You have until Labor Day to enjoy Navy Pier before its temporary closes due to the COVID-19 They are hoping to reopen in the spring of 2021. However, Offshore the world's largest rooftop bar will remain open noon until 9 p.m. week days and 11 a.m. until 10:30p.m. on Saturday, and 11 a.m. until 9 p.m. on Sunday.