Open House Chicago (OHC) is a free weekend festival held annually in Chicago that allows participants to visit dozens of buildings that are not typically open to the public. The next festival will be held on 16–17 October 2021 because 2020 was scrapped caused by the COVID-19 pandemic. OHC is organized by the Chicago Architecture Foundation over a two-day period each year in mid-October. The event promotes appreciation of architecture by the general public.