MUSIC—You’ll have to wait all the way until August’s MusicfestNW to hear the transcendent new strains of the Helio Sequence’s latest eponymous release… unless you hit this intimate, free in-store performance. I think you know what to do. MARJORIE SKINNER
Music Millennium, 3158 E Burnside, 7 pm, FREE, all ages
TV—Since 1982, the subversive, ruthless, goofy, and brilliant David Letterman has been the best thing about late-night TV. Tonight is his final show, and while it’s tempting to treat his retirement as a symbol for the end of an era when people actually watched live TV, it’s better to just say this: Tonight’s your last chance to see a new Late Show with David Letterman. He’ll be great, as always. ERIK HENRIKSEN
Your TV, CBS, 11:35 pm