PUNGENT: The Canoe Cruisers Association, Potomac Conservancy and American Canoe Association are joining with local civic groups to get stinky sewer vents along C&O Canal between Great Falls and the District line fixed. The vents, part of the Potomac Interceptor System that runs from Dulles Airport to the Blue Plains Treatment Plant, picking up sewage from communities along the way, are fitted with carbon filters to reduce smell. However, replacing them is a cumbersome job that apparently gets overlooked. The result is not pleasing hikers, joggers and boaters who use the canal and towpath. Heading the replacement effort are Mac Thornton (301-229-7430) and Matt Beres (202-338-4700).

OYSTER ROAST: The Annapolis Chapter of Ducks Unlimited holds its Outdoor Festival Sept. 26 at St. John's College. Tickets are $70 per person, $115 per couple and $10 for kids 17 and under and include bull and oyster roast, beer, wine and soft drinks plus a DU membership. Call 410-721-0691.

DOWN AND BACK: The Sierra Club has its first midweek fall hike Tuesday. Cliff Noyes leads a party along C&O Canal from Carderock to Georgetown, where hikers buy lunch, eat it in the park, then return to Carderock. Call 703-451-5181.

CUP FEVER: America's Cup challenger trials for the 31st Cup regatta start Oct. 19 in Auckland, New Zealand. Meantime, three old Cup boats will be in Chesapeake Bay next month running charters. Groups interested in chartering Ted Turner's old warhorse, American Eagle, Bus Mosbacher's Weatherly or Ted Hood's Nefertiti for a day of match-racing can do so through America's Cup Charters in Newport, R.I., at 401-846-9886.

HAWK TALK: Raptors are on the move with the changing season, and Audubon Naturalist Society members are out counting them. ANS runs a trip to Snicker's Gap in Virginia Sept. 26 to look for broadwings, accipiters and ospreys moving south along the Blue Ridge. The trip leader is Larry Cartwright, 703-379-2689.

WOMEN ONLY: Virginia's Department of Game and Inland Fisheries and the National Rifle Association are co-sponsoring two "Becoming an Outdoorswoman" workshops. The first is on the lower Eastern Shore next weekend and includes a hunt for railbirds in the coastal marsh; the second is Oct. 23 at Shady Grove Kennels in Remington, Va. Call Libby Norris at 757-253-7072, or e-mail her at Lnorris@dgif.state.va.us