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.
Alphabotanical — Pen and ink drawings by Michael Shernick. Mercury Framing, 4692 North Broadway, Boulder, www.AlphaBotanicalArt.com. Opening reception 6 p.m. Oct. 5. Through Dec. 23.
Artist of the Month Opening Reception. 2 p.m. Oct. 7. The Old Gallery, 14863 Hwy. 7, Allenspark, 303-747-2089.
Call for entries: Land Through the Lens — Photography of Boulder County parks and open space. Application deadline is Friday, Nov. 9. www.bouldercountyopenspace.org/photoshow.
Chief Niwot: Legend & Legacy. Boulder History Museum, 1206 Euclid Ave., Boulder, 303-449-3464. Through Nov. 25.
Denver Plein Air Arts Festival. The Byers- Evans House Gallery, 1310 Bannock St., Denver, 303-620-4933.
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.
J.B Sullivan and Leigh Campbell. NCAR Mesa Laboratory, 1850 Table Mesa Drive, Boulder, 303-497-1000. Through Nov. 30.
Liminality, Luminosity and the Everyday — Selections from CU’s painting collection. CU Art Museum, CU campus, Boulder, 303-492-8300. Through Dec. 22.
Now Boarding: Fentress Airports and the Architecture of Flight. Denver Art Museum, 100 W. 14th Ave., Denver, www.denverartmuseum.org. Through Oct. 7.
Open Studios Fall Artist Tour Opening Reception — Presented by OpenArts. 6 p.m. Oct. 5. Boulder Public Library Canyon Gallery, 1001 Arapahoe Ave., Boulder, 303-441-3100.
Boulder Open Space and Mountain Parks Department Community Art Show — 3 p.m. Open house. 4 p.m. Artist demonstration with Chris Brown. 5 p.m. Artist demonstration with Anne Gifford. 6:30 p.m. Information presentation. Oct. 4. Chautauqua Community House, 900 Baseline Road, Boulder, www.OSMPandtheArts.org.
Scapes. Denver Art Museum, 100 W. 14th Ave., Denver, 720-865-5000. Through Nov. 25.
Traces — New work by Sean Fitzgibbon and Linda Lowry. Firehouse Art Center. 667 4th Ave. Longmont, 303-651-2787. Through Oct. 14.
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.