“One for all, and all for one” sure doesn’t sound like our current political climate. But we’ll all be able to get a refresher in that kind of spirited unity as Metropolitan Performing Arts offers a rollicking, family-friendly version of the legendary tale of the Three Musketeers on upcoming Friday nights, as the warm-up (let’s make that cool-down) attraction before free movies in local parks and for Vancouver’s First Friday sidewalk festivities.The adventure begins at 7 p.m. tonight, as MPA launches “The Three Musketeers: An Adventure, With Music,” in east Vancouver’s Fisher Basin Park, Southeast Mill Plain Boulevard at 192nd Avenue. It’s a one-hour live performance; then, at dusk, “The Lego Ninjago Movie” shows on a big screen in the park. More performances are set for July 27 (at Columbia Tech Center Park, where the movie is “Wonder Woman”), Aug. 3 (part of First Friday, at Ninth and Main streets in downtown Vancouver) and Aug. 10 (in Marshall Park where the movie is “Jumanji: Welcome to the Jungle.”) “The Three Musketeers” follows a bold young striver who struggles to find his place among the swashbuckling swordsmen of Paris in the early 1600s. Metropolitan Performing Arts is a nonprofit, kid-oriented training ground and troupe that helps both bold and bashful young strivers find their places in the friendly world of community theater.Natural-born, “crazy outgoing” thespians who cannot wait to show off on stage can learn to focus their energies and build their skills at MPA, executive director Barbara Richardson said. And so can the quiet kids who feel a little shakier about developing talent and stepping into the spotlight — but can shine just as brightly after some nurturing, she said.Theater is a place where kids who feel like they don’t fit in anywhere else can truly find themselves, Richardson said. She hears all about that when her students do community outreach: the naturally nervous ones who build great confidence and friendships via theater arts; the bold ones who already have confidence but work toward discipline and maturity.