* Janet Jackson has added an Orange County stop to her swing through Southern California. She plays the Arrowhead Pond on Sept. 29; tickets go on sale Sunday. . . . Crosby, Stills & Nash, right, play the Greek Theatre on Sept. 16, tickets go on sale Sunday. . . . Also at the Greek, the Go-Go's and Save Ferris perform Aug. 23; tickets available Sunday. . . .Three Doors Down is joined by Seven Mary Three and Tantric for a July 27 Palladium show. Tickets go on sale Saturday. . . . Marco Antonio Solis plays the Universal Amphitheatre on Aug. 18. Tickets are available now. . . . Joan Jett & the Blackhearts play the Sun Theatre on Aug. 18; tickets on sale Monday. . . . On sale today: Tricky at the Glass House on Aug. 10 and Matthew Sweet at the El Rey Theatre on the same night. . . . Tickets are available Sunday for Jo De Messina and Shedaisy at Universal Amphitheatre on Aug. 31. . . . Show change: The July 13 Ginuwine and Juvenile show at Universal Amphitheatre has been combined with the venue's Aug. 2 Ginuwine show. Ticket-holders should seek refunds at the point of purchase. . . . On sale Friday: tickets for the Watcha Tour 2001 at Universal Amphitheatre on Sept. 6. The bill includes Molotov, Maldita Vecindad, Enanitos Verdes, Los Amigos Invisibles and Kool Keith. . . . On sale Friday: Lupillo Rivera, also at Universal, on Aug. 25. . . . Six new shows at the House of Blues are now on sale: Lizzy Borden on July 6; Tank on July 7; Buddy Miles on July 9; Super Diamond on Aug. 10; Saves the Day on Aug 16-17; and Government Mule featuring Dave Schools & Chuck Leavell on Sept. 21. . . . Now on sale at the Roxy: Eels on Aug. 11, Ky-Mani Marley and Inner Circle on July 19 and Eek-A-Mouse on July 27. . . . Marley and Inner Circle also play the Galaxy Theatre on July 21. That show is now on sale, along with two other Galaxy shows: California Guitar Trio on Aug. 19 and Spineshank on July 7. . . . Four Glass House shows go on sale today: Insolence and Corporate Avenger on July 20, Phyllis and Anyone on Aug. 17, Rx Bandits on Aug. 25 and Tsunami Band, Ruf 10 and Madcap on Sept. 8.