French and Indian War re-enactments will be held from 11 a.m. to 8 p.m. Friday, 10 a.m. to 5 p.m. Saturday and 10 a.m. to 4 p.m. Sunday at the Portersville Steam Show grounds, 1512 Perry Highway, Portersville.

A free Outdoor Discovery series, hosted by the Butler County Parks and Recreation Department, features “Backyard Predators” at 6:30 p.m. today at the park's Carousel Shelter, 184 Alameda Park Road. Admission is free. Call 724-284-5383. The program for July 24 will be ATA Martial Arts.

Cruises aboard Nautical Nature, a 37-passenger enclosed pontoon boat, includes an 90-minute narrated tour of Lake Arthur as sponsored by the Moraine Preservation Fund. Cruises take place through Nov. 2. Weekend cruises begin at 1 and 3 p.m. Saturdays and Sundays. Tickets for adults are $11 online and $12 at the gate, for senior citizens, $9 and $10, and for children, $5 and $6. Children younger than 2 are free, and all children younger than 12 must be supervised. Lunch, dinner and pizza cruises also are available. Call 724-368-9185 or visit www.moraine preservationfund.org.

Moraine State Park is the site of a family fishing program at 1 p.m. July 26. Families must be registered at www.visitPAparks.com or by calling 724-368-3612.

East Brady Riverfest celebrates its 29th annual event Friday through Sunday at Graham Field, Verner Street. It will run from 6:30 to 10:30 p.m. Friday, 11 a.m. to 10:30 p.m. Saturday and 11:30 a.m. to 5 p.m. Sunday. There will be food and craft vendors, rides and inflatables for children, live music, karaoke, fireworks, an auction, games and contests.McConnells Mill State Park in Slippery Rock Township, just over the county line into Lawrence County off Route 422, hosts “A Taste of History: Dutch Oven Cooking Demonstrations” from noon to 3 p.m. Aug. 10 and Sept. 14. The historic gristmill is open from 11 a.m. to 4 p.m. Fridays, Saturdays and Sundays through October. Call 724-368-8811.