SPORTS SELF-DEFENSE. Jae Kim, master martial arts instructor with 30 years experience, offers self-defense classes Monday and Wednesday at 6450 N. Oracle Road. First week is free. Call 797-0122 for information. TUMBLEWEED OPEN. The Tucson Chain Lightning Disc Golf Club hosts its annual Tumbleweed Open at 8:30 a.m. Saturday, March 23, and Sunday, March 24, at the Santa Cruz Riverpark, Riverview Drive west of I-10 between Speedway and Grant Road. Open to the public for viewing and competing. Categories include both amateur and professional men and women and a junior's division. Registration fees range from $20 to $50. Call Steve Kornmuller at 733-1095 for registration and information. Check out the Professional Disc Golf Association's home page on the World Wide Web: http://www.discgolf.com/pdga/pdga.html

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