The Dave Matthews Band and Tracy Chapman are the latest major acts to announce local dates. The Matthews Band is part of WBCN's "X-Mas Rave" that features shows at seven venues on Dec. 5 to benefit Stop Handgun Violence, Friends of Shannon, Tay Sachs and the Margaret Fuller House. The WBCN lineup that night, starting with the Orpheum -- Dave Matthews Band and Jewel; Avalon -- Buffalo Tom and Goo Goo Dolls; the Paradise -- Toadies, Supersuckers and CIV; Mama Kin Music Hall -- 311, Everclear, Gene and Spacehog; Middle East Downstairs -- Janet LaValley, Eve's Plum, Fledgling; Middle East