Chicago officials say they’re trying to help small businesses survive what appears will be — as President-elect Joe Biden put it — a very dark winter.

The largest party shut down by inspectors took place at the Chicago Sports Complex in Brighton Park, where 600 people gathered, none of them wearing masks, city officials said.

The measure includes a ban on short-term rentals that last only one night in an effort to block huge parties that have become a regular nuisance in some neighborhoods.

Inspectors shut down an illegal party at a Humboldt Park warehouse where revelers were not wearing masks or following social distancing rules, city officials said Monday.