Outdoor Discovery Program will feature Trapper John, whose subject is the removal of home and garden pests, at 7 p.m. tonight at the Carousel Shelter at Alameda Park, off New Castle Road. Admission is free. Call 724-284-5383.

McConnells Mill State Park, Slippery Rock Township, just over the Butler County line into Lawrence County, will host "Whole Grains" at 2 p.m. Saturday and "Heart Hike #4" at 2 p.m. Sunday. The Old Mill has tours of the grist mill at 1 and 2 p.m. Fridays, 1 and 3 p.m. Saturdays, and 2 and 4 p.m. Sundays. A new turbine has been installed in the mill, and corn grinding will be demonstrated from 11 a.m. to 3:30 p.m. Fridays and 11 a.m. to 5:30 p.m. Saturdays from Memorial Day through Labor Day. Admission and parking are free. Call 724-368-9320.

Jennings Environmental Education Center, Route 528 near the intersection of Routes 8 and 173, will host "Wildflowers of Summer" at 2 p.m. Aug. 17. Healthy Hikes are planned from 6 to 7:30 p.m. Sept. 3 and Oct. 1. Jennings is open from 8 a.m. to 4 p.m. weekdays and on weekends as scheduled. The trails are open daily from sunrise to sunset. Call 724-794-6011 to confirm programs.

Moraine State Park will be the site of "Ecology and Management of Ruffed Grouse and American Woodcock" at 1 p.m. Saturday and "Floating with Aerial Fishers" at 1 and 3 p.m. Sunday.

<B>Star Parties</B>, sponsored by the Amateur Astronomers Association of Pittsburgh, are planned for about 8:30 p.m. Friday and Saturday at the Nicholas E. Wagman Observatory at Deer Lakes Regional Park, Frazer Township, Allegheny County. Participants can observe the Hercules cluster, ring nebula and Andromeda Galaxy. Events are held weather permitting. For directions or to check weather conditions, call 724-224-2510. Admission is free, though donations are accepted to help with operational costs.

<B>McKeever Environmental Learning Center</B>, Sandy Lake, will be the site of a campfire from 9 to 10:30 p.m. Friday. The program is free. Call 724-376-1000.