COUNTYRegatta at Lake Arthur is set for 10 a.m. to 11 p.m. Aug. 6 and 10 a.m. to 6 p.m. Aug. 7. Music, a car cruise, the third annual Pennsylvania SUP Paddleboarding championship, sailing races and a native butterfly release are planned. Admission and parking are free, as are many activities. For information, visit lakearthurregatta.org.Butler County Parks and Recreation Department’s free Thursday night programs at Alameda Park include “Bats in Action” tonight and “Alpaca Palace” on Aug. 4, both at 6:30 p.m. in the Carousel Shelter. Call 724-284-5383.Moraine State Park, Muddy Creek Township, will host a program on “Venomous Snakes of Pa.” at 1 p.m. Saturday at the outdoor center on the North Shore and “Lunch at the Lake” at noon Sunday leaving from the Davis Hollow Marina (fee charged).To register, call 724-368-8811.

REGIONMcConnells Mill State Park, Slippery Rock Township, Lawrence County, off Route 422, will present the program “From Grain to Bread” from 11 a.m. to 3 p.m. Sunday. The mill is open 10:30 a.m. to 3:30 p.m. Wednesdays through Mondays. Tours are given at 1 and 2 p.m. daily. Call 724-368-8811.