Through Sept. 26: Chesapeake Changes, a natural history exhibit that focuses on the geology, geography, wildlife and human settlement in the 64,000-square mile watershed of the bay, Explorers Hall of the National Geographic Society, 17 and M streets NW, Washington, D.C.
Tuesday: DNR public meeting to discuss proposed changes in non-tidal fishing regulations, Sweadner Hall, Frederick Community College, Frederick, 7 p.m.
Wednesday: DNR public meeting to discuss changes in non-tidal fishing regulations being considered for 1994, Natural Resources Police meeting room, Routes 309 and 404, Queen Anne, Queen Anne's County, 7 p.m.
Thursday: Meeting of Potomac-Patuxent Chapter of Trout Unlimited, 125 Heurich Road, Wheaton, 7:30 p.m. Newell Steele will speak on suburban Potomac River smallmouth bass fishing.
Friday-Saturday: Maryland B.A.S.S. Federation S.Q.T. event on Potomac River.
Saturday: First Cox's Point Invitational Carp Shoot and Fishing Contest, sponsored by Maryland Bowhunters Society and Essex Recreation and Parks Council, 7 a.m. to 3 p.m.
Today: Ducks Unlimited Dick Fetzer Fun Shoot, Loch Raven Trap and Skeet Club, Dulaney Valley Road, 11 a.m. Quail walk, simulated teal and dove shoot.
(Items may be mailed to Outdoors Editor, The Baltimore Sun, 501 N. Calvert St., Baltimore, Md. 21278-0001. Please include time, date and location of events to be listed, as well as a short description of planned activities and a telephone number, including area code for more information. Outdoors Journal is published each Thursday and Sunday. Please mail listings four weeks before the event.)