Chicago Filmmakers is currently taking entries for the 37th Onion City Experimental Film Festival, which takes place April 8-11, 2027. The regular deadline is October 22 and the late deadline is November 19.

Onion City was founded in the 1980s by the Experimental Film Coalition.

Chicago Filmmakers assumed responsibility for the festival in 2001, and expanded the size and opened it up to video work as well as film. Onion City presents 8-10 programs over four days in Chicago and features approximately 60-70 works from around the world. Aside from the competition programs, there are occasional special presentations of new or older films of note or guest presentations. Screenings take place at Chicago Filmmakers and other Chicago locations.

The mission of Onion City is to provide local and regional audiences with an opportunity to view a wide variety of contemporary experimental works, focused on artistic excellence but also with an eye towards representing differing styles, forms, and nationalities.