This isn't the first time Harvey Danger have broken up. The impeccable, charming pop band have made a joke out of it in the past, playing an annual "Last Show Ever" for years, so at first I approached this so-called farewell with skepticism. Wishful thinking be damned, this time it's not a joke; after this weekend, they will never play music together again. Their last all-ages show is tonight, and tomorrow they'll perform two shows at the Crocodile. (The Vera Project, Seattle Center, 956-8372. 7:30 pm, $12/$13, all ages.)