Every Fri. Moderate-paced ride, 20 miles or more, to Dexter and beyond. Pack a lunch or stop in Dexter. See aabts.org for weather cancellations or delays. 10 a.m. sharp, meet at Delhi Metro Park parking lot (left of the tollbooth), E. Delhi off Huron River Dr. Free. [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 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 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].