Tom and Janice are taking I, Vivaldi on a Texas Book Tour to Austin, Dallas, Houston, and San Antonio. You are invited . . .     AUSTIN:     Book People     Saturday, March 8 1:00-3:00     A Thirsty Mind, Lakeway     Thursday, March 13 4:00-6:00     North Hills Gallery, Northwest Hills United Church     7050 Village Center Drive     With the Waterloo Watercolor Group Spring Exhibition     Sunday, April 13 from 12:00-2:00     Barnes & Noble, Arboretum     Saturday, March 15 2:00-4:00     Sunday, April 27 at 2:00:     A benefit with live music by the Austin Chamber Music Center     SAN ANTONIO:     The Twig Book Shop     Tuesday, March 11 3:30-5:30     Barnes & Noble, San Pedro Crossing     Saturday, May 17 at 2:00 p.m.     A reading accompanied by musicians from the San Antonio Symphony     Barnes & Noble, Northwoods     Saturday, June 21 at 11:00 a.m.     HOUSTON:     Blue Willow Bookshop     Thursday, April 3 4:30-6:30     DALLAS:     Texas Library Association Conference     April 16 to 19     Logos Bookstore, Snider Plaza     Saturday, April 19 1:00-3:00 There will be a reading on KMFA, accompanied by Vivaldi's music selected to dramatize the story and characterize the composer.     When: Sunday, March 2 at 10:00 a.m.     and repeated Saturday, March 8 at 9:00 p.m.     Where: KMFA, FM 89.5, a classical music radio station for central     Texas or online at KMFA.org     Program: "Ancient Voices," hosted by Sara Hessel