20th Anniversary Art Exhibit — With work by Russ Wiltse, Polly Addison and Dawn Siebel. Dairy Center for the Arts, 2590 Walnut St., Boulder, 303-440-7826. Through Oct. 19.
Chief Niwot: Legend & Legacy. Boulder History Museum, 1206 Euclid Ave., Boulder, 303-449-3464. Through Nov. 25.
Carol Walker, Wendy Rochman. NCAR Mesa Laboratory, 1850 Table Mesa Drive, Boulder, 303-497-1000. Through Sept. 30.
Gary Winogrand: Women Are Beautiful — Denver Art Museum, 100 W. 14th Ave., Denver, 720-865-5000. Through Sept. 30.
El Anatsui: When I Last Wrote to You about Africa. Denver Art Museum, 100 W. 14th Ave., Denver, 720-865-5000. Through Dec. 30.
Hockney and Hogarth — Selections from CU’s collection of British art. CU Art Museum, CU campus, Boulder, 303-492-8300. Through Oct. 27. Lecture by Frédéric Ogée 5 p.m. Sept. 20 at Norlin Library, room M549.
Joyanne Matthes and Vicki Dyas. The Old Gallery, 14863 Hwy. 7, Allenspark, 303-747-2089. Through Sept. 30.
Liminality, Luminosity and the Everyday — Selections from CU’s painting collection. CU Art Museum, CU campus, Boulder, 303-492-8300. Through Dec. 22.
Longmont Studio Tour Preview Exhibition. Muse Gallery, 356 Main St., Longmont, 303- 678-7869. Through Sept. 30.
Now Boarding — Fentress Airports Denver Art Museum, 100 W. 14th Ave., Denver, www.denverartmuseum.org. Through Oct. 7.
Primal Seen — Selections from CU’s photography collection. CU Art Museum, CU campus, Boulder, 303-492-8300. Through June 22.
Women of Influence: Colorado Artists and Curators; Intimate Dialogue: Seven Women, Seven Voices; La Mexicana; Female Icons in Mexican Culture. Arvada Center for the Arts and Humanities, 6901 Wadsworth Blvd., Arvada, 720-898-7200. Through Dec. 16.