Those are youth musicians from West Seattle Community Orchestras, rehearsing last night at Chief Sealth International High School for the holiday concert they’ll be part of tonight – same place – 6:30 pm. Adults $5, children $1, but as the poster says, extra donations are always appreciated! … Tonight’s lineup also includes your chance to find out why the Duwamish River cleanup “feasibility study” matters to everyone in our area – find out about it, and have your say, 5:30-8:30 pm at Concord Elementary in South Park. … The Senior Center of West Seattle presents “Spirit of Salsa,” 10-10:45 am, for fun and exercise, no partner necessary, $10 drop-in … Enjoy your West Seattle Community Centers (WSB sponsor) to the fullest – sign up for winter classes (Southwest Pool, too) starting at noon today – find the info online by going here. … And remember our special holiday links: Events list here, shopping guide here.