Every Mon., Thurs., & Sat. (different AARC locations), except Nov. 26. 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. 6 & 7. This venerable annual stamp show, Michigan’s largest, features 23 dealers and 2 auction firms from 13 states selling US and foreign stamps, covers, postcards, and collector supplies. Also, displays of stamps and postal history, a youth area with free stamps and supplies for beginning stamp collectors, a global postcard exchange, and more. The UN Postal Administration and the US Postal Service, an event cosponsor, sell recent issues. Food available. 10 a.m.–5 p.m. (Fri.) & 10 a.m.–4 p.m. (Sat.), WCC Morris Lawrence Bldg., 4800 E. Huron River Dr. Free admission. Sign-in and name tags required. (734) 761–5859, [email protected], annarborstampclub.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].

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.