Date Book

* The Dave Matthews Band, above, will be at the Irvine Meadows Amphitheatre on May 20. Tickets go on sale Saturday. . . . Tickets will be available Sunday for Loreena McKennitt, May 13 at the Universal Amphitheatre. . . . On sale today: Coal Chamber and Sevendust, May 2 at the Palace. . . . Available Saturday: Tijuana No, May 8 at the Palace; Gary Numan, May 19 at the Palace; and the Charlie Hunter Trio, May 22 at the El Rey Theatre. . . . On sale Sunday: the Moody Blues, May 29-30 at the Greek Theatre; and Mary Chapin Carpenter, June 26 at the Greek.