Every Mon., Thurs., & Sat. (different AARC locations). Runners of all abilities invited to join a 5K mapped route (Mon. & Thurs.) or either a beginner or advanced group run (Sat.). Corner Brewery (6 p.m. Mon.), 720 Norris, Ypsi.; AARC Colonnade (6 p.m. Thurs.), 901 W. Eisenhower; and AARC Traver Village (7 a.m. Sat.), 2621 Plymouth Rd. Free. annarborrunningcompany.com.

Every Sat. All invited to join a timed but noncompetitive 5K run/walk. 9 a.m., Lillie Park South, 4365 Platt. Free, but first-timers are requested to preregister at parkrun.us/lillie and arrive at 8:45 a.m. [email protected].

Every Sat. through Nov. 21. Moderate-paced ride, 20 miles or more, to Dexter and beyond. Pack something to eat or stop in Dexter or Chelsea for coffee or breakfast. Note: Riders should be prepared to take care of themselves on all AABTS rides. Carry a water bottle, a spare tire or tube, a pump, a cell phone, and snacks. See aabts.org for weather cancellations or delays. 10 a.m. sharp, meet at Barton Nature Area parking lot, 1010 W. Huron River Dr. near Bird. Free. (734) 649–9762, [email protected].

Nov. 21 & 22. Show and sale of thousands of tropical and hardy orchids, orchid-growing supplies, and related items. Also, free talks and demos by orchid growers on the “Basics of Growing Orchids” (11 a.m.) and “How to Repot or Mount Your Orchid” (1:30 p.m.) on both days. 10 a.m.–4 p.m., U-M Matthaei Botanical Gardens, 1800 N. Dixboro Rd. Free admission; metered parking. (734) 647–7600, annarbororchidsociety.org.

Every Wed., Fri., & Sat. All invited to play one of 200 songs, with melodies transcribed in numbers, on the 17-bell chime’s numbered keys. Ambitious players can add chords. Kids welcome. Noon–12:30 p.m. (Wed. & Fri.) & 10:30–11 a.m. (Sat.). Free. [email protected].

Nov. 11, 13, 18, & 21. Community gatherings and talks by local practitioners.

Nov. 11 (6–8 p.m.): “Witches Night Out.” Group meeting and discussion.

Nov. 13 (6:30–8:30 p.m.): “Tarot, Mocktails, and Witches.” Local author Lindsay Merbaum leads a night of witchery, tarot, and a reading from her new dark fantasy novel, Witches of the Wheel.

Nov. 18 (6:30–8:30 p.m.): “Goddesses of the Arbor.” Discussion geared toward late millennial and Gen X women.

Nov. 21 (11 a.m.–1 p.m.): “Death Cafe.” Frank conversation about death led by Ann Arbor Death Cafe representatives.

Various times, 114 S. Main, upstairs. Free. (734) 665–2757, crazywisdom.net.

Every Tues.–Sun., except Nov. 26. All age 6 & up invited into the museum’s labs to use scientific tools and museum specimens to answer questions and solve problems. The newest program examines how membranes can help solve water shortages. 11 a.m.–3 p.m., 1105 North University. Free. (734) 764–0478, ummnh.org. 

Every Sat. & Sun., except Nov. 15, 28, & 29. Hands-on 20-minute family-oriented demo for age 5 & up that explores magnetism, magnetic fields, and what they have to do with everyday life. 12:30 & 2:30 p.m., 1105 North University. Free. (734) 764–0478, ummnh.org.