This is our town. This is the biggest city in Washington State, and there are many suburbs. Everett is the next big city to the north, Bellevue is the big city to the East, and Tacoma is the big city to the south. This wiki can support activities beyond the city limits of Seattle, but it is primarily in King County, and within driving distance of Seattle.
Seattle has many neighborhoods, and meetups need to be convenient for the people gathering. Seattle has enough density for meetups to have new influxes of people, but many meetups have a few core people and a lot of flux.
Learning a language may requires a lot discipline or opportunities to practice. There are places to be immersed in Korean, Mandarin, Nuer, Arabic, Cantonese, Vietnamese, and Spanish.
Neighborhoods in Seattle Propper
From the North to south (as of 2019.02.08 this list is just getting started)
(Lynwood is a city to the north)
Shoreline and Northgate (more) people who live up here likely have to drive...
Crown Hill Greenwood Green Lake
Ballard -- Freemont - Wallingford - U district
Magnolia(isolated) Interbay QueenAnne South Lake Union Eastlake Montlake
Belltown, Downtown, Capitol Hill (Lake Washington?) Ca
Pioneer Square Chinatown First Hill
West Seattle (isolated) SoDo Beacon Hill??
South Seattle (isolated) Rainier
Burien Tukwila and Renton Issaquah
Seatac, Kent Covington Maple Valley
Federal Way, Auburn, Black Diamond
Pierce, (has towns sumner and puyallup edgewood and Tacoma)