Tucson Letter Writers Club - Mostly Books, 6208 E. Speedway. Write letters to friends like in the old days. The club supplies everything but the stamps. 7-8 p.m. Thursdays. Free. 571-0110.
Square Dancing Fun - Tanque Verde Lutheran Church Fellowship Hall, 8625 E. Tanque Verde Road. Learn the basics of square dancing and meet new friends. All ages. 6:30-7:45 p.m. Thursdays. $5 first visit; $4 thereafter. 250-8339.
Hawaiian Splash Family Bash - Ott Family YMCA, 401 S. Prudence Road. Music, food and pool party event. A family film will begin after sundown. Come in Hawaiian attire; participate in our best-dressed contest and make a splash in our cannonball contest. 6-9 p.m. Aug. 2. $2 per person or $10 maximum per family. 885-2317.
Classic Car Show - Little Anthony's Diner, 7010 E. Broadway. Trophies awarded in several categories; dash pins to the first 75 cars registered. DJ, Hula-Hoops, bubble-gum-blowing contests, the bunny hop and a jumping castle. Registration begins at 5 p.m. Food available for purchase. 7-10 p.m. Free. 296-0456.
Emerge Center Against Domestic Abuse Benefit - Charlie's Comic Books, 5460 E. Speedway. Silent auction of original art and raffle of action figures and graphic novels, with all proceeds benefiting Emerge. Artist will provide free sketches, and there will be a coloring contest for kids. 10 a.m.-5 p.m. Free. 320-0279.
Meet the Hohokam - Saguaro National Park East, 3693 S. Old Spanish Trail. Meet the early inhabitants of Saguaro National Park in this indoor presentation. Discover what the early desert people used for food, shelter and clothing. 10 a.m., 3 p.m. Saturdays; 11 a.m. Sundays. Free. 733-5153.
Handi-Dogs Celebration - Handi-Dogs, 75 S. Montego Drive. Information session about training your dog to help with mobility issues, hearing impairments, diabetes, PTSD, anxiety and other chronic health conditions. Also learn about taking your dog to visit patients. Graduation celebration starts at 4:15 p.m.; public is welcome. 3-4 p.m. Aug. 4. Free. 326-3412.
"Color Play" Art Exhibition - Desert Artisans' Gallery, 6536 E. Tanque Verde Road. New works by Gail Brynildsen, Pamela Howe, Susan Meyer, Terry Slonaker, Jan Thompson and Alexandria Winslow. 10 a.m.-5 p.m. Mondays-Saturdays; 10 a.m.-1:30 p.m. Sundays. Free. 722-4412.
Earth, Water, Fire and Wind - Academy Village Long Gallery, 13715 E. Old Spanish Trail. Catherine Friederich presents art jewelry with semiprecious stones and metal. 9 a.m.-4 p.m. Monday-Friday. Free. 647-0900.
Recent Photography Work - Academy Village Long Gallery, 13715 E. Old Spanish Trail. Photographer Blair Friederich presents his most recent work. 9 a.m.-4 p.m. Monday-Friday. Free. 647-0900.
Mariachi Extravaganza - The Gaslight Theatre, 7010 E. Broadway. Performing will be Mariachi Sonido de Mexico, Mariachi Cielo de Mexico and special guests. 7-9 p.m. Aug. 5. $19.95 per person plus tax; discounts for children 12 and younger. 886-9428.
Cienega Creek Nature Walk - Gabe Zimmerman Davidson Canyon Trailhead at Cienega Creek Natural Preserve, 16000 E. Marsh Station Road. Explore the cool, shaded trails at the Cienega Creek Natural Preserve during this guided morning nature walk. For age 10 and up. Reservations required. 7-8:30 a.m. Free. 615-7855.
"The Incredible Spider-Guy" - The Gaslight Theatre, 7010 E. Broadway. Musical spoof starring your friendly neighborhood web-head. 7 p.m. Tuesdays-Thursdays; 6 and 8:30 p.m. Fridays and Saturdays; 3 and 6 p.m. Sundays. $18.50; discounts available. 886-9428.
Photographs by Members and Friends of UUCT - Unitarian Universalist Church of Tucson, 4831 E. 22nd St. 9 a.m.-1 p.m. Wednesdays through Fridays; 11:45 a.m.-1 p.m. Sundays. Free. 748-1551.
Go to dailystarcalendar.com for more calendar listings and to submit an event at least three weeks in advance.