Zoning Code 101: The History & Mystery of Title 33, sponsored by city of Portland Development Services Center, noon to 1:30 p.m., 1900 S.W. Fourth Ave., second-floor conference room, 2500-A. Call 503-823-7310.
Job finders support group, sponsored by local job seekers, noon to 2 p.m., Capitol Hill Library, 10723 S.W. Capitol Highway. Call 503-684-3581.
O'Reilly Open Source Convention, through Friday, July 11, 8:45 a.m. to 6 p.m. or later, Portland Marriott Downtown, 1401 S.W. Naito Parkway, $1,095 for whole week or $400 per day. Call 1-800-998-9938.
Metro Referrals business-leads group, 7 a.m. to 8 a.m., SMILE Station, 8210 S.E. 13th Ave. Call 503-232-9787, Ext. 5.
The Economic Downturn: Stimulus for Sales Breakthrough, sponsored by LionHeart Consulting Inc., noon to 1:30 p.m., Mallory Hotel, 729 S.W. 15th Ave., $20 includes lunch. Call 503-632-8572, Ext. 3.
Improve public speaking skills, sponsored by PacMasters Toastmasters, 12:05 p.m. to 1 p.m., Multnomah Building, Rooms 235 A and B, 501 S.E. Hawthorne Blvd. Call 503-284-0686.
OSCAMP: Open Source in Oregon, sponsored by Software Association of Oregon, event coincides with O'Reilly Open Source Convention, 1 p.m. to 6 p.m., World Trade Center #2, 121 S.W. Salmon St., registration required. Call 503-228-5401.
Better communication and public speaking, sponsored by Oregon Trail Toastmasters, 6:45 a.m. to 7:55 a.m., Legacy Good Samaritan Hospital Neurological Sciences Center, 1040 N.W. 22nd Ave. Call 503-221-1581.
Essential Security: What Every Business Must Know About Computer Security, sponsored by Beaverton Area Chamber of Commerce, 7:30 a.m. to 8:30 a.m., Kingstad Center, 15450 S.W. Millikan Way, Beaverton, $5 nonmembers. Call 503-644-0123.
Advanced Essentials of Management, sponsored by IEC Group, 8 a.m. to 5 p.m., also Thursday. Sweetbrier Inn, 7125 S.W. Nyberg Road, Tualatin, $385. Call 503-626-7527.
CPR and first aid training, sponsored by Liberty Northwest Insurance Corp., 8 a.m. to noon, Liberty Centre Auditorium, 650 N.E. Holladay St., $30 first-time certification, $25 recertification. Call 1-800-463-6381.
Intel's Experience in China, sponsored by Northwest China Council, talk by Intel Corp. Vice President James Jarret, noon, House of Louie Restaurant, 331 N.W. Davis St., $20 members, $25 nonmembers, $15 students. Call 503-973-5451.
Enhance public speaking skills, sponsored by Oregon 424 Toastmasters, noon to 1 p.m., Standard Insurance Building, Conference Room B, 900 S.W. Fifth Ave. Call 503-275-0454.