Last year the indefatigable pianist, composer, and bandleader Marshall Vente took on a Sunday night slot at WDCB (the College of DuPage radio station), and he's now added concert promotion to the mix. Instead of staring idly at his vacant January calendar, he has pulled together three days of music featuring several of the bands he leads--such as his Latin jazz group Tropicale and the original vehicle for his energies, the delightful little big band called Project 9 Plus--as well as groups headed up by various Vente sidemen. (These include guitarist Frank Dawson, whose careening melodies ricochet off a song's hidden angles; alto man Jeff Newell, who digs his heels in a little deeper every time he plays; and smooth-lined trumpeter Steve Schneck.) That Vente could organize this undertaking--even getting WDCB to cosponsor, while using station paraphernalia and the promise of ads in the Vente Festival program book to solicit underwriting contributions--should come as no surprise to fans of his music: despite his fluent keyboard work and enjoyable compositions, his greatest strength has always lain in his abilities as an arranger. Friday, 5 PM-1:30 AM (Vente small group, Alejo Poveda & Chizil, Frank Dawson Group); Saturday, 6:30 PM-1:30 AM (Isidro Perez Group, Tropicale, Jeff Newell Quartet); Sunday jazz brunch 11 AM-4 PM (Steve Schneck Quartet, Project 9 Plus); Andy's, 11 E. Hubbard; 642-6805. This writer will emcee on Friday.