The guest speakers at a meeting of the Arizona Mystery Writers, from 10 a.m. to 2 p.m., Saturday, Dec. 12, will be a deputy assigned to the Pima County Sheriff's Department's auto theft and arson unit and a tactical operator on the S.W.A.T. team. A Christmas murder-mystery workshop will also be featured. Prices with lunch: $12.50 members; $17.50 nonmembers. Without lunch: $5 per session for members; $10 for nonmembers. RSVP is required by Monday, Dec. 7. Call 360-6360, or e-mail firstname.lastname@example.org to RSVP or for more information.