Last July, jam-pop outfit Dispatch played its final concert at Boston, MAs Hatch Memorial Shell. Six months later, two-thirds of the popular trio reunited at New York Universitys Skirball Center as part of the colleges charitable Tsunami Relief Extravaganza. A few songs into his performance yesterday, Brad Corrigan welcomed former bandmate Pete Heimbold for a surprise mini-set, which included Prince of Spades, Ride a Tear, and Two Coins. Organized by NYUnited, the multi-band bill also featured Sekou tha Misfit, Steve Connell, Travis Sullivans Bjorkestra and Donny McCaslin. _ Reporting by Adam Alperowicz _