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The all-ages show has been a basic tenet of the punk-rock ethos in D.C. ever since Ian MacKaye and Jeff Nelson first set out in ’79 to rally for the kids as the Teen Idles. Having spent my own disgruntled teen years craving live music in a town with few all-ages venues, I still harbor an itch of contempt for the over-21 scene. So when the otherwise very cool Velvet Lounge takes its first tentative step toward the all-ages enterprise this weekend at the urging of Engine Down and Darkest Hour, you can bet I’ll be there to show my support—especially since the spasmodic, bass-loaded Engine Down (with newly minted copies of its debut record, Under the Pretense of Present Tense, in tow) is the most intense thing happening in today’s hardcore scene. With Cross My Heart and Proximity Fuse at 2 p.m. at the Velvet Lounge, 915 U St. NW. $3. (202) 462-3213. (Colin Bane)