A free concert by Italian singer Matteo Setti, who is filming his first public television special at the California Theatre of the Performing Arts, is at 7 p.m. Saturday (March 22) in the historic downtown venue. Presented by International Media and billed as "Italian Classic Meets American Cool," the concert is first-come first served and general admission seating. The theater, at 562 W. Fourth St. and between E and F streets, opens at 6 p.m. Discovered by legendary Italian tenor Luciana Pavarotti, Setti performs a variety of swing era classics, including "Luck Be a Lady," "That's Life," "For Once in My Life," "Volare," and many other classic Italian and American hits. American