Seattle-based Trumba has added another newspaper to its list of customers, saying yesterday that the Chattanooga Times Free Press is the latest firm to use its online event calendar. Trumba said that the Chattanooga Times is using its Trumba Connect event calendaring solution, to list local events in the community. Size of the sale was not disclosed. Trumba is backed by venture capital firms August Capital, Kleiner Perkins Caufield and Byers, and Oak Investment Partners.