5K, 10K, 1.2-mile, and half-mile open water races. Awards, medals for finishers, T-shirts, & more. Proceeds benefit North Star Reach, a camp for kids with life-threatening medical conditions. Races begin from 6:30 a.m.–9:30 a.m. (registration opens at 5:45 a.m.) Halfmoon Lake beach, 8725 Hankerd, Gregory. $180–$225 in advance at swimtothemoon.net; prices increase on race weekend. Michigan Recreation Passport (daily, $12 at the gate) required for each vehicle. (734) 585–7101.

Every Sun. Dancers of all ages and abilities invited for free-form dancing to a variety of recorded music, from EDM to classical and ambient to world music. Wear loose clothes, barefoot or stocking feet. 10:45 a.m.–1 p.m. A2 Yoga, 2030 Commerce. $20 (age 11 & under, free) cash or Venmo (@andjru) at the door only. tinyurl.com/ecstatic-dance-a2.

50+ local artisans, live music, food trucks, and more to celebrate 35 years of the Sunday Artisan Market, a juried market where artists and craftspeople show their work every Sunday, from April through the Sunday before Christmas. Work includes paintings, prints, ceramics, jewelry, woodcraft, drawings, candles, fabric & textile products, soap & personal care goods, repurposed items, and more. 11 a.m.–4 p.m., Kerrytown Farmers Market pavilion. Free admission. (734) 913-9622 (voicemail only), [email protected], sundayartisanmarket.org.

All invited to cheer on Pioneer High students as they play a friendly exhibition match to benefit patients at U-M’s pediatric critical care program. ECMO (Extracorporeal Membrane Oxygenation) is an advanced life-support machine that saved now 15-year-old Pioneer High soccer player Deedler’s life. Noon, Pioneer High School Hollway Field, 601 W. Stadium at Main. $5 cash at the gate.

Every Sat. & Sun. and Fri. Aug. 7 & 21. On Sat. and Sun., conservancy staffers present and give insights into some animals with superpowers, including an African crested porcupine, a three-banded armadillo, and a frilled dragon at 1 & 4 p.m., and an animal keeper shows a Gila monster at 2 & 3 p.m. During the Friday Adult Open Hours (age 18+ only), conservancy staffers show all four animals at 7:30 p.m. All tickets include a chance to see the conservancy’s other animals. Noon–5 p.m. (Sat. & Sun.) & 7–9 p.m. (Fri.), 4950 Ann Arbor–Saline Rd. $15 (kids ages 2–12, $13; under age 2, free) cash or credit at the door only. (734) 929–9324, thecreatureconservancy.org.

Film screenings every day. Tickets $11.75 unless otherwise noted (children under 12, students, seniors age 65 & older, and U.S. veterans, $9.75; Marquee Arts members, $8) in advance online (recommended) & at the door. For updated schedule, see marquee-arts.org/calendar. 

Aug. 16: “Woodstock” (Michael Wadleigh, 1970). Documentary about the legendary 1969 music festival. 1:30 p.m.

Every Wed.–Sun., June 25–Aug. 30. (See review) Kate Thomsen directs longtime Purple Rose resident playwright Carey Crim’s comedy-drama about a group of old friends gathered to celebrate their friend Emma’s fourth wedding. Together, they revisit their memories of each of her previous three weddings to “the one.” Adult language and subject matter. 3 p.m. (Wed., Thurs., & Sat.), 8 p.m. (Fri. & Sat.), & 2 p.m. (Sun.). 137 Park St., Chelsea. Tickets $31.50–$52.50 in advance at purplerosetheatre.org, (734) 433–7673, & (if available) at the door. Discounts available.

Aug. 7–22. Emily Wilson-Tobin directs local actors in Anthony King and Scott Brown’s 2-man musical about a pair of aspiring playwrights who perform all the parts in a run-through for potential backers of their new, hilariously ill-advised project—a big, splashy musical about printing press inventor Johannes Gutenberg. Adult themes. 8 p.m. (Thurs., Fri., & Sat.) & 2 p.m. (Sun.), Cahoots, 206 E. Huron St. Tickets $28 (seniors, $25 & students, $20) in advance at pennyseats.org & (if available) at the door.

Aug. 13–16 & 19–22. Karrie Waarala directs local actors in Cleveland playwright Eric Coble’s 2009 dark satire exploring art, commerce, and censorship. The plot, based on a 1996 staging of Tony Kushner’s Angels in America in Charlotte, North Carolina, follows a theater company in a major Southern city as it puts on a controversial play featuring foul language, homosexual themes, and 7 minutes of full frontal male nudity. Leading up to the premiere, the city’s mayor brings legal action, locals threaten to burn the theater down, and the terrified actors exchange cans of pepper spray as opening night gifts. “The broad laugh-out-loud humor narrows slowly toward a poignant ending, making a fantasy into a reality,” writes one Charlotte Observer reviewer. 7:30 p.m. (Thurs.–Sat.) & 2 p.m. (Sun. & Wed.), Riverside Arts Center, 76 N. Huron St., Ypsi. Tickets $20 (students & seniors, $15) in advance at ptdproductions.com & at the door. (734) 483–7345.

See 13 Thursday. Today: Joël Henning Doty’s Dispersion, about a woman in a coma who hears her children’s true feelings about family secrets, communicates with her dead husband, and gets lessons from a funny, wise nurse, or, maybe, an angel? 2 p.m.

Aug. 9 & 16. A fully unscripted one-act theatrical show about the appearance of a new cryptid that shakes up a small town. 6–7 p.m., 2350 W. Liberty. $15 in advance at heardotsay.com/events & $18 (if available) at the door.

Every Sun. Ballroom dancing to recorded music, including foxtrots, waltzes, cha-chas, rumbas, tangos, swing, and more. No partner necessary. Preceded at 6 p.m. by beginning lessons and practice. 7–9 p.m., Michigan Union Ballroom. $5 ($10 includes lessons). (734) 763–6984.