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.