1 Hiking the Pacific Crest Trail
Bill Hawley will give a presentation on hiking the Northwest section of the Pacific Crest Trail; he will talk about the trail’s history, how to access the trail and how it can fit your recreation plans; Hawley is the Washington representative of the Pacific Crest Trail Association; 7-8:15 p.m. Wednesday; REI, 625 Black Lake Blvd. SW, Suite 410, Olympia; free; register at rei.com/olympia; 360-786-1938.
2 Peer into Puget Sound
The South Sound Estuary Association is holding a Pier Peer event, allowing participants to see what creatures live in Puget Sound; not appropriate for children younger than 6; 9 p.m. Friday; Boston Harbor Marina, 312 73rd Ave. NE, Olympia; $10 for people 12 and older, free for ages 6-11 with an adult; register at sseacenter.org/pier-peer.
3 Gig Harbor Salmon Derby
Anglers will compete for the $3,000 first prize during the 20th annual event put on by the Gig Harbor Chapter of Puget Sound Anglers; fishing allowed in marine areas 11 and 13 from daylight-2 p.m. Saturday; headquarters is at Point Defiance Boathouse, 5912 N. Waterfront Drive, Tacoma; tickets are $36.25, free for children 14 and younger; 253-255-8168, gigharborpsa.org.
4 Annual astronomy fair
Learn about astronomy, take part in activities and look at the sky during the Tacoma Astronomical Society’s Astronomy Fair XIII; noon-5 p.m. and 9-11 p.m. Saturday, Pierce College Fort Steilacoom, 9401 Farwest Drive SW, Lakewood; free; tas-online.org.