1 Fitness bike ride
This Capital Bicycle Club ride puts the emphasis on fitness and paceline riding skills; pace is 18-plus mph; distance is about 25 miles; be ready to go at 5:30 p.m. Tuesday; meet at 3800 Lorne St. SE, Tumwater; rider leader Bill Stevenson, 360-402-2234; capitalbicycleclub.org.
2 Famous women astronomers
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Julie Lutz, University of Washington emeritus research professor of astronomy, will give a program on women in astronomy at the meeting of the Tacoma Astronomical Society; 7:30 p.m. Tuesday; Thompson Hall, Room 175, University of Puget Sound, Tacoma; tas-online.org.
3 Tibetan wildlife
Rich Harris will talk about the wildlife that lives on the Tibetan plateau at the meeting of the Black Hills Audubon Society; Harris has worked with local Chinese governments for 25 years to conserve wildlife there; social hour at 7 p.m., with the program at 7;30 p.m., Thursday; First Christian Church, 701 Franklin St. SE., Olympia; blackhills-audubon.org.
4 Remove invasive weeds
Volunteers are needed to assist Harbor WildWatch to remove invasive weeds from Donkey Creek Park; bring your own gloves and tools, as well as snacks and drinks; all ages are welcome; 9 a.m.-noon, Saturday; Donkey Creek Park, 8714 Harborview Drive, Gig Harbor; for information, send an email to Stena@harborwildwatch.org.