"CHON: A Nearly Fatal Illusion" - Biosphere 2 Gallery @ The University of Arizona Biosphere 2, 32540 S. Biosphere 2 Road, Oracle. Biosphere 2 artist-in-residence Deborah Ford's new photographic works. 9 a.m.-4 p.m. daily. Included with $20 admission; discounts available. 838-6200.
Student Artwork From the Arizona State Schools for the Deaf and the Blind - Tohono Chul Park, 7366 N. Paseo del Norte. 9 a.m.-5 p.m. daily. Included with $8 admission. 742-6455.
Great Literature of All Times - Oro Valley Library, 1305 W. Naranja Drive. "The Jilting of Granny Weatherall" from "Flowering Judas and Other Stories" by Katherine Anne Porter. Presented by Bill Fry. 10 a.m.-noon Feb. 21. Free. 594-5580.
Magic Tree House Book Club - Oro Valley Library, 1305 W. Naranja Drive. "Polar Bears Past Bedtime" by Mary Pope Osborne. Activities, crafts and discussion. Registration required. 4-5 p.m. Feb. 21. Free. 594-5580.
AARP Tax-Aide - Oro Valley Library, 1305 W. Naranja Drive. Volunteer-run tax-preparation and assistance serving low- and moderate-income taxpayers, with special attention to those over age 60. 1-4 p.m. Tuesdays and Thursdays. Free. 594-5580.
Beat Cancer Boot Camp Exercise Classes - Northwest Community Park, 7601 N. Mona Lisa Road. Exercise and support classes for cancer survivors and anyone touched by cancer. Meets once a week. 5:30-6:30 p.m. Thursdays. $35 for eight weeks. 546-1601.
Farmers Market at Dove Mountain - Highlands at Dove Mountain, 4949 W. Heritage Club Blvd. 9 a.m.-1 p.m. Thursdays. Free. 603-8116.
Geology of the Tucson Mountains - Saguaro National Park Red Hills Visitor Center, 2700 N. Kinney Road. 2:15-3 p.m. Feb. 21. Park entrance fee. 733-5158.
Drop-in Computer Help - Oro Valley Library, 1305 W. Naranja Drive. A computer instructor is available to answer questions people might have on a wide variety of computer topics. 11 a.m.-1 p.m. Feb. 21. Free. 594-5580.
Ceramics Show and Sale - Tohono Chul Park, 7366 N. Paseo Del Norte. Featuring more than 20 ceramicists from Southern Arizona Clay Artists. 10 a.m.-4 p.m. Feb. 22-23. Free admission to the park. 742-6455.
Toddler Storytime - Oro Valley Library, 1305 W. Naranja Drive. Stories, songs and rhymes for accompanied children 18 to 36 months old. 10-10:30 a.m. Fridays. Free. 594-5580.
Catalina Art and Farmers Market - 16733 N. Oracle Road. 10 a.m.-2 p.m. Fridays. Free. 825-4427.
Ask a Master Gardener - Oro Valley Library, 1305 W. Naranja Drive. Master Gardeners from the Pima County Cooperative Extension answer gardening questions. 1-2:30 p.m. Feb. 22. Free. 594-5580.
Friday Fun Knitters - Foothills Mall, 7401 N. La Cholla Blvd. Knitters of any skill level are welcome. Meet in the food court. 10 a.m. Fridays. Free. 293-0781.
UA Museum of Art Lecture Series - Oro Valley Library, 1305 W. Naranja Drive. "A New Deal for Artists: Creating Art During the Great Depression," presented by Jacquelyn Feller. 2-3 p.m. Feb. 22. Free. 594-5580.
Birding Adventure - Saguaro National Park Red Hills Visitor Center, 2700 N. Kinney Road. Join an expert birder on a 100-yard nature walk. 10:45-11:30 a.m. Fridays. Park entrance fee. 733-5158.
"My Friend From India" - The Comedy Playhouse, 3620 N. First Ave. Comedy. 7:30 p.m. Fridays and Saturdays; 3 p.m. Sundays. $18; discounts available. 260-6442.
Southern Arizona Symphony Orchestra - DesertView Performing Arts Center, 39900 S. Clubhouse Drive, SaddleBrooke. Symphonic and operatic pieces featuring soprano Christi Amonson and violist Hong-Mei Xiao. 7:30-9 p.m. Feb. 23. $21 in advance; $23 at the door. 825-2818.
Vista Fine Arts Presents Augsburg Centennial Singers - Vista de la Montaña United Methodist Church, 3001 Miravista Lane. Minneapolis-based group performs folk songs, spirituals, familiar hymns and barbershop selections. 3-4:30 p.m. Feb. 23. Free. 825-1985.
Trottin' Into Spring Arts and Crafts Show - La Posada Lodge and Casitas, 5900 N. Oracle Road. Annual show. Raffle benefits HEART (Happy Equine Acres Rescue and Therapy) of Tucson. 9 a.m.-3 p.m. Feb. 23. Free. 797-1751.
Market on the Move - Santa Catalina Catholic Church, 14380 N. Oracle Road. 8-11 a.m. the fourth Saturday of the month. $10. 825-9611.
Honey Bee Canyon Park Birding Walk - Honey Bee Canyon Park, 13880 N. Rancho Vistoso Blvd. Spot Gambel's quail, verdins, gnatcatchers and other birds of the Southwest desert. Reservations required. 8-9:30 a.m. Feb. 23. Free. 615-7855.
Mason Center Saturday Morning Bird Walks - Mason Center, 3835 W. Hardy Road. Learn the basics of birdwatching and how to identify the backyard birds commonly seen in the Tucson area. Advance signup required. Saturdays. Free. 209-1811.
Outdoor Family Day: On the Mountain Lion Trail - Felíz Paseos Park, 1600 N. Camino de Oeste. Learn the ways of a wildlife biologist and how wildlife cameras and wildlife tracking devices are used to monitor the movements of wildlife. Reservations required. 9-11 a.m. Feb. 23. Free. 615-7855.
Computer Tutoring - Oro Valley Library, 1305 W. Naranja Drive. Each 30-minute session is one-on-one with the instructor. Registration required. 9 a.m.-1 p.m. Feb. 23. Free. 594-5580.
Where the Hot Things Are - Saguaro National Park Red Hills Visitor Center, 2700 N. Kinney Road. Join a naturalist in search of signs of life from some of the often unnoticed yet unique creatures of the park. 10:45-11 a.m. and 11:15-11:30 a.m. Feb. 24. Park entrance fee. 733-5158.
Baby Storytime - Oro Valley Library, 1305 W. Naranja Drive. For accompanied babies up to 18 months. Children do activities that promote development and learning. 10-10:30 a.m. Mondays. Free. 594-5580.
Science Fiction Book Club - Oro Valley Library, 1305 W. Naranja Drive. "Flowers for Algernon" by Daniel Keyes. 6-7 p.m. Feb. 26. Free. 594-5580.
Preschool Storytime - Oro Valley Library, 1305 W. Naranja Drive. Designed for 3- to 5-year-olds and their parents or caregivers. Children do activities that promote development and learning. 11:30 a.m.-noon Tuesdays. Free. 594-5580.
Community Food Bank of Southern Arizona Farmers Market - Marana Health Center, 13395 N. Marana Main St. 3-6 p.m. Tuesdays. Free. 616-1425.
Sonoran Sleuths Mystery Book Club - Oro Valley Library, 1305 W. Naranja Drive. "The Bone Yard" by Jefferson Bass. 11 a.m.-noon Feb. 27. Free. 594-5580.
Brown Mountain Hike - Tucson Mountain Park, 8451 W. McCain Loop Road. Learn how desert plants and wildlife have adapted to their environment during an interpretive hike led by Pima County naturalist Meg Quinn. 9 a.m.-noon Feb. 27. Free; Reservations required. 615-7855.
Sonoran Desert Weedwackers - Tucson Mountain Park, 2020 N. Kinney Road. Help eradicate buffelgrass and fountain grass. Work may require hiking and pulling buffelgrass on steep slopes. Call for meeting location. 8-11 a.m. Feb. 27. Free. 615-7855.
Exploring Google - Oro Valley Library, 1305 W. Naranja Drive. Learn features about the search engine including news, maps, videos, calendars and health and financial information. 2-5 p.m. Feb. 27. Free. 594-5580.
Go to dailystarcalendar.com for more calendar listings and to submit an event at least three weeks in advance.