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The Rosslyn Jazz Festival, which takes place every September in Rosslyn’s Gateway Park, has in the past generally been a small-scale fest (one day, outside the city, with free admission) with a small-scale lineup.

Not this year. It’s the festival’s 20th anniversary, and it’s responding with some A-tier musicians. Headlining on September 11 is Tierney Sutton, the tremendously acclaimed (and Grammy-nominated) vocalist; the supporting cast includes the Afro-Bop Alliance, an award-winning and energetic-as-hell Latin jazz septet from Annapolis; the Bad Plus, the Midwestern trio who have made an enormous reputation with their performances of rock songs and quirky originals in an avant-garde context; and Jason Moran Bandwagon, whom I’ve already told you about.

That there is a can’t-miss event, especially with no cover.