Mercer Island This Week: Historical Society SCUBA Talk Wednesday, Trick-or-Treat and Holiday Makers Market Ahead (October 19–26, 2026)

Saturday's Fall Recycle Event is in the books and the Farmers Market has wrapped for the year, so this week is a quieter one on the island — but there's a great local-history evening on Wednesday and Halloween is right around the corner. Here's what's on for October 19–26.

MERCER ISLAND HISTORICAL SOCIETY TALK — Wednesday, October 21, 2026 | 7:00 PM | Mercer Island Community & Event Center

Speaker Matt McCauley presents "Beneath the Surface: 45 Years of SCUBA Diving into Mercer Island's History and Other Island Historical Trivia," a look at island history from under the water line.

LOOKING AHEAD — TOWN CENTER TRICK-OR-TREAT — Friday, October 30, 2026 | 4:00 PM – 6:00 PM | Mercer Island Town Center

Town Center merchants hand out treats to costumed kids in the City's annual family-friendly Halloween event. Businesses that want to participate are asked to contact the City by Friday, October 23.

LOOKING AHEAD — HOLIDAY MAKERS MARKET — Saturday, December 5, 2026 | Time and venue to be confirmed

The City lists the Holiday Makers Market, held in partnership with the Mercer Island Chamber of Commerce, for December 5. 2026 details haven't been posted yet, so check the City or Chamber before you go.

A note on First Friday Art Walk: the monthly Town Center art walk typically falls on the first Friday evening of the month, but a November 2026 date hasn't been confirmed. Check with participating galleries before heading out.

Event details can change, so check with the City of Mercer Island Parks & Recreation or the organizers before heading out. Whether you're a longtime islander or just getting to know Mercer Island, fall is a great time to experience the community. Curious what it's like to live here year-round? I'm always happy to talk.