Jan. 3-6 Northeastern Weed Science Society, annual meeting. Hyatt Regency, 300 Light St.Contact: A. Richard Bonanno, 987- 682-9563. Estimated attendance: 300
Jan. 5-7 Mid-Atlantic Nurserymen's Association, trade show. Convention Center, Pratt and Howard streets. Contact: Carville Akehurst, 410-882-5300. Estimated attendance: 8,000
Selected conventions of general interest or with public exhibits, as listed by the Baltimore Area Convention and Visitors Association.