Passenger Trains > National Train Day Seattle Area.

From All Aboard Washington Website

National Train Day at Everett Station
Sounder commuter rail equipment on display. All Aboard Washington will be hosting a table with information about our organization, NARP, our Talgo trains, Operation Lifesaver and more.
When Sat May 12 8am – 1pm Pacific Time
Where 3201 Smith Avenue Everett, WA (map)

National Train Day At Edmonds Station
The Swamp Creek & Western Model Railroad Club will have its open session for the public. Their model railroad is spetacular. All Aboard Washington will be hosting a table with information about our organization, NARP, our Talgo trains, Operation Lifesaver and more.When Sat May 12 10am – 2pm Pacific Time
Where 210 Railroad Avenue Edmonds, WA (map)

National Train Day at the Northwest Railway Museum
See historic Snoqualmie on a beautiful May day, visit the restored 1890 Snoqualmie Depot, ride a vintage train past the top of Snoqualmie Falls and celebrate all things train. It’s National Train Day and a great day to celebrate!Remember, Moms Ride Free with a paying child of any age, Mother’s Day Weekend, May 12 & 13.When Sat May 12 11am – 4pm Pacific Time
Where Northwest Railway Museum, 38625 Southeast King Street Snoqualmie, WA 98065 (map)

Don't forget Olympia/Lacey as well. It's also posted on the All Aboard WA web site.

I left it off, since you had already posted that one.
Hope you have a good turn out!
I don't expect much of a crowd in Everett.